What is Base64? A Deep Dive for Developers

Every developer has seen those long strings of random-looking characters — something like SGVsbG8gV29ybGQ= — and wondered what on earth they are. That's Base64 encoding, and once you understand it, you'll start seeing it everywhere: in JWTs, email attachments, CSS stylesheets, API payloads, and more. Let me break it down properly — not just the "what", but the "how" and "why" too. So what actually is Base64? Base64 is a way to represent binary data as plain text. Computers store everything as bi