The Central Processing Unit (CPU) is the brain of the computer where all logical and mathematical calculations are performed. It processes instructions, performs computations, and manages data flow within the computer.

The four major data processing functions of a computer are:

1. Gathering Data (Input): Collecting raw data for processing.
2. Processing Data into Information: Converting raw data into meaningful output.
3. Storing Data or Information: Saving the data for future use.
4. Output: Presenting the processed data.

The Delete key is used to remove characters or elements to the right of the cursor. In contrast, the Backspace key is used to delete characters to the left of the cursor.

In an email account, the mailbox is the storage area where incoming and outgoing emails are stored. It includes folders like Inbox, Sent, Drafts, and Trash, allowing users to organize and access their email messages.

• Shift + Enter: Used in word processors (e.g., MS Word) to insert a line break within the same paragraph.
• Alt + Enter: Used in spreadsheet applications like Excel to insert a line break within a single cell.