What is Unicode and which encodings are common for it?

What is Unicode and which encodings are common for it?

• A. Unicode encodes characters from many writing systems; UTF-8/UTF-16 are common encodings.
• B. Unicode is a password policy.
• C. Unicode is a network protocol.
• D. Unicode is a file system.

Answer: (A)

Unicode provides a universal set of code points for characters used across many writing systems. It defines which characters exist and how they are identified, while encodings determine how those code points are stored or transmitted as bytes. Common encodings used for Unicode text are UTF-8 and UTF-16. UTF-8 is variable-length (one to four bytes per character) and ASCII-compatible, making it extremely popular for the web and data interchange. UTF-16 uses 16-bit units and often requires surrogate pairs for characters outside the Basic Multilingual Plane, and it’s common in many software environments and Windows APIs. The other options describe password policies, network protocols, or file systems, which are unrelated to how Unicode represents characters.

Unicode provides a universal set of code points for characters used across many writing systems. It defines which characters exist and how they are identified, while encodings determine how those code points are stored or transmitted as bytes. Common encodings used for Unicode text are UTF-8 and UTF-16. UTF-8 is variable-length (one to four bytes per character) and ASCII-compatible, making it extremely popular for the web and data interchange. UTF-16 uses 16-bit units and often requires surrogate pairs for characters outside the Basic Multilingual Plane, and it’s common in many software environments and Windows APIs. The other options describe password policies, network protocols, or file systems, which are unrelated to how Unicode represents characters.