The term "stack" refers to a collection of programming languages, software tools, and technologies. A stack is generally divided into two types: application stacks and technology stacks. MERN Stack is a popular alternative to MEAN Stack in which traditional Angular.js is replaced with React.js, making development much smoother and more accessible. Join FITA Academy's MERN Stack Training Institutes in Chennai. It provides advanced certification training as well as 100% job placement assistance.