🧠
What is Memory Allocation? Every app you open (Chrome, Spotify, Games) needs space in your computer's RAM to run. Memory Allocation is how the OS decides WHERE in RAM to put each app — and what happens when things get messy.
Strategy:
Add App:
RAM — 512 KB  
0 KB128 KB256 KB384 KB512 KB
App / Process Free Space Fragmented Gap
0 KB
Used
512 KB
Free
0
Free Gaps
0
Apps Open
What's happening right now?
RAM is completely empty. Ready to load some apps! Try clicking "Run Guided Demo" to see everything explained step by step.
🏃
First Fit — Active Strategy
Scans from the start of RAM and places the app in the first gap that's big enough.
Open Apps in RAM
AppAtSizeClose
No apps in RAM yet.
OS Memory Log
[ OS ] RAM initialized. 512 KB available.
📚
Understanding Memory Allocation
Everything you need to know — click a tab below

🖥️ Your computer runs many apps at the same time.
Each one needs a dedicated slice of RAM to store its data while it's running.

Without memory allocation, apps would overwrite each other's data and crash. The OS carefully tracks which part of RAM belongs to which app.

👉 Memory allocation is the system that makes multitasking possible.

🧩 The Fragmentation Problem:
When apps close, they leave behind empty holes of different sizes.

Imagine this RAM state:

Spotify
30KB
Chrome
20KB
VS Code

50 KB is free total, but the biggest single gap is only 30 KB. A 40 KB app CANNOT open even though there's "enough" RAM! This is External Fragmentation.

🏃 First Fit — Fastest
Starts from the beginning and grabs the first gap that fits. Like sitting in the first available seat on a bus. Fast, but causes clutter at the front over time.
🧩 Best Fit — Most Efficient
Searches all gaps and picks the one that leaves the least leftover space. Like finding the parking spot that fits your car most snugly. Saves space but creates many tiny useless gaps.
📦 Worst Fit — Most Room Left
Always picks the biggest gap. Leaves a large leftover chunk so future apps can also fit. Good for future apps, but wastes space on current allocations.

🌍 Memory Allocation in Real Life:

📱
Smartphones — Android/iOS allocate RAM per app. When RAM fills up, old apps are automatically "killed".
🎮
Games — Loading a level allocates RAM for textures & audio. Finishing the level frees it all.
🌐
Web Browsers — Each tab = its own memory block. Too many tabs → "Out of memory" crash!
🖥️
Operating Systems — Windows/Linux/macOS use these exact algorithms to manage hundreds of programs at once.