Imagine a website as a public library. You visit the library to read books, find information, or browse magazines. The library is mostly about viewing and reading content that is already there. You walk in, pick up a book, and read it. You don't usually change the books or add new ones yourself.
Now, think of a web application as a workshop inside that library. In this workshop, you don't just read books; you can create your own projects, use tools, and interact with machines. You might design something, save your work, or even collaborate with others. The workshop is interactive and lets you do things, not just look.