Computer (Part-5)

• The primary key can be a column or a collection of columns that uniquely identify the record.
• Relational database is a system of establishing relationships between databases used by different types of software systems.

• The word "Routing is derived from 'Route which means-Path".
• The 'route' algorithm is used to decide the path to transfer packets from the source point to the destination.
• The router searches its routing table to determine the best path to transfer the packets.
• Through this search, the packets have to be matched with its destination IP address.

• Files left in the Recycle Bin are permanently deleted when they are emptied manually.

• A pixel is the basic logical unit in digital graphics.
• Pixels are combined to form a complete image, video, text, or any visible thing on a computer display.
• A pixel is also known as a picture element (pix picture, el = element).

Constantly running system-program processes are known as daemons (in Unix-like operating systems) or services (in Windows operating systems).

• These background processes typically start when the operating system boots up and continue to run in the background, performing essential tasks without direct user interaction.
• They often listen for specific events or requests and respond accordingly.

A cursor (or sometimes called an insertion point) is the vertical blinking line in a text editor that indicates the place where anything that is typed will appear.

• It essentially shows you your current position within the text document.
• As you type, the cursor moves to the right, indicating where the next character will be inserted.
• You can also move the cursor around the document using the arrow keys, the mouse, or other navigation commands.

• It is prevalent among scientific, engineering, and academic institutions due to its most appreciative features like multitasking, flexibility, and many more.
• In UNIX, the file system is a hierarchical structure of files and directories where users can store and retrieve information using the files.

• Syntax in computer programming means the rules that control the structure of the symbols, punctuation, and words of a programming language.

Caches are

• small,
• high-speed memory units

placed between the CPU and main memory. They store frequently accessed data, allowing the CPU to retrieve information quickly without needing to access the slower main memory.

• They aim to connect wired network hardware in an Ethernet LAN, metropolitan area network (MAN), or wide area network (WAN).