An indexing and abstracting service is like a big library that helps people find information. Imagine you have a lot of books and you want to find a specific book, but you don't want to look through every single book. That's where an indexing and abstracting service comes in. They read all the books and create a list of important ideas called an index.
This index is like a giant dictionary with all the important words and ideas that are talked about in the books. Then, they create a short summary of each book called an abstract. This helps people decide if they want to read the entire book or just the important parts.
So, if you want to find a book about cats, you can look at the index and find all the books that mention cats. Then, you can read the abstracts to see which book is the best fit for what you need. An indexing and abstracting service saves people time and helps them find the exact information they need.