Explanation

• Ctrl + Z used for = Undo

Additional information:

• Ctrl + X used for = Cut
• Ctrl + Y used for = Redo

Last verified on 07-06-2026

Explanation

• The SQL command used to retrieve data from a database table is the SELECT statement.
• This command is fundamental to the Data Query Language (DQL) in SQL.

Last verified on 07-06-2026

Explanation

• A Modem (Modulator-Demodulator) converts digital signals into analog signals and vice versa.
• It is used to connect computers to the internet via telephone lines or other networks.

Additional information:

• Switch – connects multiple devices in a network
• Hub – basic network connector
• Repeater – boosts signal strength
• Router – directs internet traffic

Last verified on 19-04-2026

Explanation

• FILO (First In Last Out) means the first inserted item is removed last.
• This behavior matches a Stack data structure.
• Stack works on push and pop operations.
• It is used in function calls and undo operations.
• Elements are accessed only from the top.

Additional information:

• Stack — FILO / LIFO
• Queue — FIFO

Last verified on 07-02-2026

Explanation

• Creeper virus Initial release date: 1971
• Creeper virus developer: Ray Tomlinson
• Creeper virus was created in 1971 by Bob Thomas.
• Creeper virus Operating system(s) affected: TENEX
• Creeper was the first computer worm.

Additional information:

• Reaper was the first antivirus software.

Last verified on 07-06-2026