ELI5: Explain Like I'm 5

Application framework

An application framework is like a big toolbox that helps software developers build programs. It includes libraries, tools and building blocks that help programmers write code faster and make programs that are fast and reliable. Think of it like Legos: the framework is like the box of basic pieces that make up the structure of a Lego house, and then the programmer can add in their own details like furniture to make the house their own.