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A database is "a repository of data organized and managed according to the structure of the data". data structure to organize, store, and manage a repository of data". It is a collection of large amounts of data that are stored in a computer over time, organized, ****able, and uniformly managed.

A database is a warehouse for storing data. It has a large storage space and can store millions, tens of millions, hundreds of millions of data. But the database does not store data randomly, there are certain rules, otherwise the efficiency of the query will be very low. Today's world is an Internet world filled with data, filled with a lot of data.

That is, this Internet world is the world of data. There are many sources of data, such as travel records, consumption records, web pages viewed, messages sent, and so on. Apart from text type data, images, music, sounds are all data.

In the history of the development of databases, databases have gone through various stages of development such as hierarchical databases, mesh databases, and relational databases, and database technology has been developing rapidly in various aspects.

In particular, relational databases have become the most important member of the current database products, since the 80's, almost all of the database vendors new database products support relational databases, even if some of the non-relational database products almost all have interfaces that support relational databases.

This is mainly because traditional relational databases can better solve the problem of managing and storing relational data. With the development of cloud computing and the advent of the big data era, relational databases are increasingly unable to meet the needs of the main reason is that more and more semi-relational and non-relational data need to be stored and managed by the database.

At the same time, the emergence of new technologies, such as distributed technology, also put forward new requirements for database technology, so more and more non-relational databases began to appear.

This type of database and the traditional relational database in the design and data structure is very different, they emphasize the database data of high concurrency read and write and storage of large data, this type of database is generally known as NoSQL (Not only SQL) database. Traditional relational databases have remained strong in some traditional areas.