Page Replacement Algorithms (FIFO, Optimal, & LRU) in 10 Minutes!

Struggling with Operating Systems? In this video, we break down the three most important Page Replacement Algorithms: FIFO (First-In-First-Out), Optimal, and LRU (Least Recently Used). We’ll walk through step-by-step numerical examples for each, calculate page faults, and discuss the pros and cons—including the famous Belady’s Anomaly. Whether you're studying for university exams or GATE/UGC NET, this guide has you covered! What You’ll Learn: 🕒 FIFO: The simplest approach (and why it fails). 🎯 Optimal: The "perfect" algorithm that predicts the future. 🧠 LRU: The most practical approach used in modern systems. 📊 Page Fault Calculation: How to solve any numerical problem. Timestamps: 0:00 - Introduction to Page Replacement 1:30 - FIFO Algorithm (First-In-First-Out) 3:45 - Belady’s Anomaly Explained 5:00 - Optimal Page Replacement 7:30 - LRU (Least Recently Used) 9:15 - Summary & Comparison Table #OperatingSystems #ComputerScience #GATE2026 #OS #TechTutorial #Programming