• The purpose of the exit() function is to terminate the execution of a program.
• The "return 0"(or EXIT_SUCCESS) implies that the code has executed successfully without any error.

Cyber Security is defined as the practice of protecting systems, networks, and data from a broad spectrum of digital threats. It aims to ensure the confidentiality, integrity, and availability of information. 

• Template (or Design Template) option can be used for creating a new presentation using already available colors and graphics.
• Templates provide pre-designed layouts, themes, and styles to ensure a consistent look and feel across all slides. 

• Function keys are the special keys on a computer keyboard labeled F1 through F12, typically located at the top.
• F5 is used for refreshing pages or starting slideshows.
• F6 is often used to highlight the address bar in browsers.
• F7 is commonly used for spell checking in Microsoft programs.

• In a file path, the hierarchy moves from the root directory (the top-level) down to the specific file or folder. 
• Root: C:
• Subdirectories: Documents and files 
• -> Desktop -> City -> Market
• Innermost/Last Directory: Computer (this is the final folder in the path). 

• name (Username/Local Part)
• @ (The separator)
• gmail.com (Domain Name)

In professional and general e-mail communication, using a Wrong E-mail Address must be avoided to ensure the message reaches the intended recipient and to prevent potential privacy breaches or miscommunication. 

• In email, documents, images, and videos can be sent as attachments.
• An email attachment is a file (such as a document, photo, or video) sent along with an email message. 

Mail merge is the standard feature in word processing and email systems used to combine a main document (the email template) with a data source (containing user names, email addresses, etc.).

• To send an email, the Receiver's Email Id (also known as the recipient's address) is the primary mandatory requirement. Just as a physical letter requires a delivery address, the email system uses the receiver's unique identifier to route the message to the correct mailbox.
• While a sender's own address is also technically required by the system to identify the origin, the most critical piece of information the user must provide to initiate a send is the destination address.