Base64 is a fundamental encoding scheme used universally across the internet to transmit binary data over text-based protocols.
Why Encode Data?
Protocols like HTTP, SMTP, and HTML were designed for text. When you need to embed an image directly into CSS or transfer an authentication token, you must convert binary data (1s and 0s) into safe, printable ASCII characters. Base64 translates 3 bytes of data into 4 ASCII characters.
Security Misconception
Base64 is an encoding scheme, NOT encryption. Anyone can decode a Base64 string instantly. Never use Base64 to 'hide' sensitive data unless it is first encrypted via standard cryptographic methods.