What is the difference between a goroutine and threads in terms of execution and performance?

Goroutines are lightweight threads managed by the Go runtime, not the operating system. They have a smaller stack size (starting from a few kilobytes and can grow dynamically), allowing thousands or even millions of goroutines to run simultaneously.

Differences:

• Execution: OS threads are scheduled by the kernel, and switching between them is costly. Goroutines are scheduled by the Go runtime, and switching between them is faster and more efficient.
• Performance: Goroutines consume less memory and resources, enabling the creation of highly concurrent applications with lower overhead.

Thus, goroutines provide more efficient and scalable parallel execution compared to traditional threads.