A full-text database is kind of like a big book with a lot of words. But instead of being just any book, it's a book that has a special superpower! This book can help you find any specific word or phrase you're looking for really easily, just like magic!
Here's how it works: the book has a special feature where it saves information about every single word that's in the book. It writes down not just the word, but also what page it's on, what chapter it's in, and even the sentence it's a part of.
This way, if you want to find a specific word, you don't have to read the whole book (which could take forever!). Instead, you can just ask the book's special feature to look up that word for you. The feature will quickly search through all the information it has saved about the book's words, and then show you exactly where your word appears in the book.
A full-text database works kind of the same way, but with a computer instead of a book. It's a special kind of database that can save information about every single word in a bunch of different documents (like articles, books, or web pages). Then, if you want to find a specific word or phrase, you can ask the database to look it up for you. The database will search through all the information it has saved about the words in those documents, and then show you all the places where your word or phrase appears.
So it's kind of like having a really smart librarian who can instantly find any book that has the word you're looking for, no matter how many books there are!