What is a query?

Answer 1

It's how SQL interact with database structure. you can do 4 main operation: create, delete, insert and update. SQL queries are near to english language. for example consider this very simple query:
"SELECT * FROM user WHERE age > 18"
assuming that an user table exists and this table has a age column( field), this query will return all the users with an age of 18+😊

Answer 2

A query is a question in sql format

Answer 3

It is English like language written to interact with database.