E-commerce, short for "electronic commerce," is simply buying and selling products or services over the internet. Instead of shopping in a physical store, customers browse products on a website, add items to an online cart, and then check out by paying digitally. E-commerce covers everything from small online shops selling handmade goods to big retailers like Amazon. It allows businesses to reach customers anywhere in the world, making it easier for people to shop from the comfort of their own homes.