Botnet:
A botnet is a group of computers connected to the Internet that have been compromised by a hacker using a computer virus or Trojan horse. An individual computer in the group is known as a "zombie" computer.

Malware:
Malware is short for "malicious software". Malware is used to mean a "variety of forms of hostile, intrusive, or annoying software or program code." Malware could be computer viruses, worms, Trojan horses, dishonest spyware, and malicious rootkits

Safer Internet Day (SID) 2018 is celebrated around the world in February of every year with a theme of "Create, connect and share respect: A better internet starts with you".

Electronic governance or e-governance is the application of information and communication technology (ICT) for delivering government services

Dongle refers to removable component used for enabling software protection. E.g.USB, Wi-Fi.

Webpage :
A webpage is a page of a Website. A webpage can be accessed by a URL in a browser and that page can be copied and or send to a friend for review whereas websites are collections of multiple page that must be navigated to view other content.

Social Networking:
i) Social networking is the use of internet based social media programs to make connections with friends, family, classmates, customers and clients. Social,networking can be done for social purposes, business purposes or both.
ii) The programs show the associations between individuals and facilitate the acquisition of new contacts. Examples of social networking includes Facebook.

i) e-commerce (electronic commerce or EC) is the buying and selling of goods and services, or the transmitting of funds or data, over an electronic network, primarily the Internet.
ii) These business transactions occur either business-to-business, business-to-consumer, consumer-to-consumer or consumer-to business.
iii) Largest e-commerce companies in India are Flipkart, Snapdeal, Amazon India, Paytm.

(i) The internet has also facilitated the introduction of a new market concept consisting of virtual shops.
(ii) They provide information about products or services for sale through www servers" Using the internet services customers can submit specific product queries and request specific sales quotes.
(iii) Example amazon. com is a www based bookshop on the internet where information on all types of international books can be found and books can be ordered online.

The heart of intranets and the internet is called as the Domain Name System(DNS), the way computers can contact each other and do things such as exchange electronic mail or display Web pages. The Internet Protocol (IP) uses this Internet address information and the DNS to deliver mail and other information from computer to computer

Familiar Internet Browser:
i) Google Chrome is a freeware familiar web browser developed by Google Inc. It is best for its speed, simplicity, security, privacy and custornlzatlon features. Google Chrome supports on Android 4.0 or higher, iOS 6.0 or higher, Mac OSX 10.6 or higher and Windows (XP or higher) and Linux system.
ii) Mozila Firefox is a free and open source web browser developed by Mozilla Foundation and Mozilla Corporation. Firefox is default browser in Ubuntu. It supports Windows, Mac OS X, Linux and Android system.
iii) Internet Explorer commonly known as Microsoft Internet Explorer or Windows Internet Explorer is the first or default browser for a Windows Pc. It is developed by Microsoft.
iv) Safari is a web browser developed by Apple Inc and comes with OS X and iOS. Some version of safari browser also supports in Windows Operating System. Exclusively used in Apple Mac system.

Following is the do's and don't of safe surfing on Internet:
1. Don't give out your personal information - Don't put personal details such as your home address, telephone numbers or parent's work address online as cybercriminals can use this information to create a fake profile, with your details.
2. What goes online, stays online - Use privacy settings to make sure only your friends and family can see photos you post. Avoid posting holiday plans as criminals may track your movements
3. Check your security and privacy settings - Make sure your social network privacy settings are secured so only your friends can see your personal information and use your privacy settings to restrict who can see your posts, videos and photos
4. Password safety - Sharing your password with your parents is a sensible idea, but avoid sharing your password with your friends, even if they promise they won't tell anyone! Also, when setting your password, make sure it isn't something people may guess such as your pet's name. Use a mixture of letters, numbers and upper and lower case characters
5. Always protect your mobile device - Make sure your mobile phone is pin-protected so all your personal information stored on it is safe. Download a security app which allows you to remotely wipe any personal data, should your mobile be lost or stolen
6. Don't talk to strangers online or offline - Don't meet up with strangers and let your parents know if a stranger has tried to get in contact with you online
7. Listen to the adults who are known to you - Adults will always be worried about you. Help set their mind at rest and avoid chatting online with strangers
8. Be wary of unsecured or unknown websites - When shopping online, use reputable and known retailers.
9. Be careful what links you click on - Avoid clicking links in an email, Instant Message or on your social network unless you are sure the message is from someone you know.

(i) Google Chrome is a freeware familiar web browser developed by Google Inc. It is best for its speed, simplicity, security, privacy and customization features. Google Chrome supports on Android 4.0 or higher, iOS 6.0 or higher, Mac OSX 10.6 or higher and Windows(XP sp2 or higher)and Linux system
(ii) Moziia Firefox is a free and open source web browser developed by Mozilla Foundation and Mozilla Corporation.FireFoxis default browser in Ubuntu It supportsWindows, Mac OS X, Linux and Android system
(iii) Internet Explorer commonly known as Microsoft Internet Explorer or WindowsInternet, Explorer is the first or default browser for a Windows Pc. It is developed by Microsoft.
(iv) Safari is a web browser developed by Apple Inc. and comes with OS X and iOS. Some version of safari browser also supportsinWindowsOperating System. Exclusively used inApple Mac system

Structure of email: Click the Compose button and then writing an e-mail contents.

When sending an e-mail message, several fields are required to be filled:
(i) The To field is where you type the e-mail address of the person who is the recipient of your message.
(ii) The From filed should contain you e-mail address.
(iii) If you are replying to a message, the To and From fields are automatically filled out; if it's a new message, you'll need to enter them manually.
(iv) The Subject should consist of a few words describing the e-mail's contents. The Subject lets the recipient see what the e-mail is about, without opening and reading the full e-mail. This field is optional.
(v) The CC (Carbon Copy) field allows you to specify recipients who are not direct addressees (listed in the "To" field). This field is optional.
(vi) The BCC (Blind Carbon Copy) field is similar to CC, except the recipients are secret. Each BCC recipient will receive the e-mail, but will not see who else received a copy. The addressees(anyone listed in the "To" field) remain visible to all recipients. This field is optional.
(vii) Finally, the Message Body is the location you type your main message. It often contains your signature at the bottom; similar to a handwritten letter.