Question 1

What is the difference between ASCII and Unicode?

Accepted Answer

ASCII has 128 characters (7-bit). Unicode supports 143,000+ characters including all world scripts and emoji.

Question 2

What is UTF-8?

Accepted Answer

Variable-width Unicode encoding. ASCII characters use 1 byte, others use 2-4 bytes. Most common on web.

Question 3

Why do computers use binary?

Accepted Answer

Electronic circuits have two states: on/off, high/low voltage. Binary (0 and 1) maps directly to these states, making digital logic simpler and more reliable.

Question 4

Why is hexadecimal used in programming?

Accepted Answer

Hex is compact: each digit represents 4 binary bits. A byte (8 bits) is exactly 2 hex digits (00-FF), making memory addresses and color codes readable.

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