(a) Punctuation keys:
Punctuation keys on a keyboard are used to input various punctuation marks and symbols. These keys include characters such as commas, periods, semicolons, colons, question marks, exclamation marks, parentheses, hyphens, and more. Punctuation keys allow you to format and structure your written language by inserting these necessary symbols into your text.
(b) Return key:
The Return key, also known as the Enter key, serves several functions depending on the context:
1. In text editing or word processing software: Pressing the Return key typically creates a new line or paragraph in your document, advancing the cursor to the next line.
2. In a command-line interface (CLI): In a terminal or command prompt, pressing the Return key executes the command you've entered, sending it to the system for processing.
3. In web forms and data entry: Pressing Return often submits the form you've filled out on a website.
4. In some user interfaces: In certain software or applications, the Return key might perform specific actions like confirming a selection or sending a message.
In summary, the Return key is used to input a newline character in text, execute commands, or trigger specific actions depending on the software or interface you're using.