Classifying e-commerce according to the parties involved:
1. Business to consumer (B2C) : Transactions happen between businesses and consumers. In B2C e-commerce, businesses are the ones selling products or services to end-users (i.e. consumers).
2. Business to business (B2B) : As its name states, B2B e-commerce pertains to transactions conducted between two businesses. Any company whose customers are other businesses operate on a B2B model.
3. Consumer to business (C2B) : Consumer to qusiness e-commerce happens when a consumer sells or contributes monetary value to a business. Many crowdsourcing campaigns fall under C2B e-commerce.
4. Consumer to consumer (C2C) : As you might have guessed, C2C e-commerce happens when  something is bought and sold between two consumers. C2C commonly takes place on online marketplaces such as eBay, in which one individual sells a product or service to another
5. Government to business (G2B) : G2C transactions take place when a company pays for government goods, services, or fees online. Examples could be a business paying for taxes using the Internet.
6. Business to government (B2G) : When a government entity uses the Internet to purchases goods or services from a business, the transaction may fall under B2G e-commerce. Let's say a city or town hires a web design firm to update its website. This type of deal may be considered a form of B2G.
7. Consumer to government (G2C) : Consumers can also engage in B2C e-commerce. People paying for traffic tickets or paying for their car registration renewals Online may fall under this category

Opera. Konqueror, Lynx, Dillo, Mosaic are the other Internet browesers.
(i) Lynx : Lynx is a customizable text based web browser for use on cursor- addressable character cell terminals. It is the oldest web browser still in active development and general use having started in1992.
(ii) Opera : Opera is a web browser for windows, mac. OS and linux operating system developed by a Norwegian company opera software OS.
(iii) Kongueror : Konqueror, a free and open source web browser and file manager, provides web access and file - viewer functionality for file systems. It forms a core part of the KDE software compilation.
(iv) Dillo : Dillo is a minimalistic web browser particularly intended for older or slower computers and embedded systems. If supports only plain HTML/ XHTML and images over HTTP.
(v) Mosaic : Mosaic is the web browser that popularized the www and the Internet. It was also a client for earlier Internet protocols such as FTP, NNTP and Gopher.

(i) Internet telephony using VolP (Voice-over Internet Protocol) Example Skype
(ii) Job search : Nowadays, many people search for their jobs online using naukri.com, monster.com, recuritmentindia.com etc as it is quicker.
(iii) Online Shopping : The internet has also facilitated the introduction of a new market concept consisting of virtual shops. For example amazon.com
(iv) Stock market updates : Selling or buying shares sitting on computer through internet. Several websites like ndtvprofit.com, moneypore.com, provide information regarding investment.
(v) Travel : One can use internet to gather information about various tourist place .it can be used for booking Holiday tours. Some of the web sites providing this service are goibibo.com, makemytrip.com, olacabs.com.
(vi) Research: Research papers are present online which helps the researcher do a literature review.
(vii) Video conferencing : It enables direct face to-face communication across networks via web cameras, microphones, and other communication tools.

(i) Wireless: Radio frequency bands are used in place of telephone or cable networks. One of the greatest advantages of wireless Internet connections is the "always-on" connection that can be accessed from any location that falls within network coverage. Wireless connections are made possible through the use of a modem, which picks up Internet signals and sends them to other devices.
(ii) Mobile : Many cell phone and smartphone providers offer voice plans with Internet access. Mobile Internet connections provide good speeds and allow you to access the Internet.
(iii) Cable : Cable Internet connection is a form of broadband access. Through use of a cable modem, users can access the Internet over cable TV lines. Cable modems can provide extremely fast access to the Internet.
(iv) Satellite : In certain areas where broadband connection is not yet offered, a satellite Internet option may be available, Similar to wireless access, satellite connection utilizes a modem.
(v) ISDN: ISDN (Integrated Services Digital Network) allows users to send data, voice and video content over digital telephone lines or standard telephone wires. The installation of an ISDN adapter is required at both ends of the transmission-on the part of the user as well as the Internet access provider.

Depending upon geographical area covered by a network, it is classified as:
(i) Local Area Network (LAN)
(ii) Metropolitan Area Network (MAN)
(iii) Wide Area Network (WAN)
(iv) Personal Area Network (PAN)
(v) Campus Area Network (CAN)
(iv) Wireless Local Area Network (W-LAN)
(i) Local Area Network (LAN)

Range	Upto 10 km
Location	Refers to same office, same building, same company and in same school
Speed	Upto 10-100 Mbps
Advantage	Low Cost, Resource Sharing, Security
Disadvantage	Area Covered Limited When Number of nodes increases,Performance Decreases

(ii) Metropolitan Area Network (MAN)

Range	10 to 15 Miles
Location	MAN is a network designed to extend over an entire city.
Speed	Upto 5 - 10 Mbps
Advantage	Wider than LAN.
Disadvantage	Data rate is slow compared toLAN Cost higher than LAN.

(iii) Wide Area Network (WAN)

Range	Above 1000 Kms
Location	It Span entire countries and continents.
Speed	Upto 256 Kbpsto 2 Mbps.
Advantage	Large geographical Areaz
Disadvantage	1. Complicated and Complex. High Cost. 2. Requires high Performance. Devices. 3. Low security. Cost higher than LAN.

(iv) Personal Area Network (PAN)

Range	Upto 100 meters
Location	Used for shorter distance, controlled by a single person within a single building
Speed	Up to 250 Kbps.
Advantage	1. Efficient, Cost effective and convenient. 2. Controlled by a single person Hotspot may connect upto 8 devices.
Disadvantage	1. Shorter distance upto 10 meters only. 2. Data rate is low compared to other network.

 (v) Campus Area Network (CAN)

Range	Upto 5 Kms
Location	Larger than LAN, but smaller than MAN. University, school or small business, enterprise
Speed	40 KB/s TO 1 MB/s
Advantage	Cost effective, Wired or Wired Network, High Bandwith Multidepartmental Network access
Disadvantage	Difficult to manage

(iv) Wireless Local Area Network (W-LAN)

Range	Upto 50 Kms
Location	Ranges from a single room to an entire campus Uses Wifi or Bluetooth, Radio waves
Speed	1 Mbps to 54 Mbps.
Advantage	Portable Installation is quick and easy
Disadvantage	Low Bandwith due to interference