A database is a "warehouse for organizing, storing and managing data according to the data structure". It is a large number of data sets that are stored in computers for a long time, organized, enjoyed and managed in a unified way.
A database is a warehouse for storing data. Its storage space is very large, and it can store millions, tens of millions and hundreds of millions of pieces of data. But the database does not store data at will, and there are certain rules, otherwise the query efficiency will be very low. Today's world is an internet world full of data, full of a lot of data. That is, this internet world is the data world. There are many sources of data, such as travel records, consumption records, web pages visited, messages sent and so on. Besides text data, images, music and sounds are all data.