Processes vs Threads: Key Differences Every Developer Should Understand

A software engineering student explains the distinction between processes and threads after studying operating systems. A process is an isolated, running program with its own dedicated memory, while a thread is a smaller unit of execution that shares memory within a process. Because threads share the same memory space, they communicate more easily but risk interfering with each other, whereas processes require special mechanisms like pipes or sockets to exchange data. Process creation is more resource-intensive than spawning a thread, and a crashed thread can bring down its entire parent process, unlike isolated process failures. Modern web browsers illustrate this well — each tab typically runs as a separate process, while multiple threads within each tab handle rendering, networking, and user input simultaneously.