A tech stack refers to the combination of technologies used to build and run software applications. It typically includes a programming language, a framework, a database, and a server environment. Understanding the tech stack is crucial for software development as it influences the application’s performance, scalability, and maintainability. Selecting the right components allows developers to leverage specific features and capabilities tailored to their project needs. Additionally, a well-defined tech stack can enhance collaboration among team members by standardizing tools and processes, ultimately leading to more efficient development cycles and successful project outcomes.