Why are indexes needed?

Indexes exist to speed up searching and filtering data in a collection.

#At a junior level, the gist in 3 points:

1. Fast search Instead of scanning every document, the database finds the right ones through the index right away.
2. Query optimization Filters, sorting, and find() run faster, especially on large collections.
3. Less load on the server Queries use fewer resources and run faster.

#An analogy

An index for a database is like a "table of contents in a book". Instead of flipping through the whole book, you jump straight to the page you need.

Summary: indexes make queries faster and more efficient, especially when there's a lot of data.