Using the FILE Menu
1. Select the File or Folder you wish to Rename.
2. Click File → Rename.
3. Type in the new name.
4. To finalise the renaming operation, press Enter

(i) Ubuntu is a Linux-based operating system. It is designed for computers, smart phones, and network servers.
(ii) The system is developed by a UK based company called Canonical Ltd.
(iii) All the principles used to develop the Ubuntu software are based on the principles of Open Source software development.

Difference between Thunderbird and Firefox in Ubuntu:
(i) Thunderbird is inbuilt email software of ubuntu whereas Firefox is a web browser.
(ii) Thunderbird is used to access email such as Gmail, hotmail whereas Firefox is used to open web pages including e-mail.

(i) Ubuntu has less hardware support for commercial/industrial/medical/ logistical therefore its less voted for use in big time backends.
(ii) Ubuntu doesn't support middlewares such as C panel, cloud linux and a plethora of other infrastructure or monitoring tools.
(iii) Hard to install graphic drivers especially for old hardwares. It is not possible to play the modern games, because of poor graphics quality.
(iv) The user switching from windows will not like the user experience on Ubuntu and will have difficulty in operating the OS.
(v) Ubuntu is not capable of playing MP3 files by default.

Uses of Cortana:
1. Cortana is a voice activated personal assistant.
2. Give the reminders based on time, places, or people.
3. Track packages, teams, interests, and flights.
4. Send emails and texts.
5. Manage the calendar and keeps up to date.
6. Create and manage lists.
7. Chit chat and play games.
8. Find facts, files, places, and info.
9. Open any app on the system.

Yes, hard drives and floppy drives are represented with drive letters.
A: drive is used for floppy disk of 3.5 inches and storage capacity of 1.44 MB.
B: drive is for floppy of size 5.25 inches and of storage capacity of 1.2 MB
So, we can say like
A: First Floppy Drive
B: Second Floppy Drive
C: D:E:.....Z: Hard Disk Drives, CD/DVD

When we open multiple applications, each application opened on the system takes some internal and hardware resources to keep it running. Memory is used by all the applications. System processing speed will be shared and it will become slow finally the system will hang.
Methods of reducing it:
1. It is advisable to run one program at a time.
2. Upgrade RAM
3. Clean the cache Memories
4. Defragmentation can be done

1. It saves space and increases system performance.
2. Sharing and protection
3. Segment and segregate the data to defend it from cyber attack.