All the data in a website is stored and queried in your database. When we say data, it is all about the facts or details of a person, a place, a thing, or any objects. An example of data is the name, age, weight and height of a person. A database is a structured collection of data which makes data management a lot easier. A database is where all your data are stored which are organized into several groups or tables. It is almost the same of having one spreadsheet or excel where you collect all the data, however, the database can perform the same compilation and management of data in greater volumes.
The way to access, send queries or basically manipulate your database is through SQL which stands for Structured Query Language. SQL is the standard language that communicates with databases. Not only SQL can perform queries but it also can execute, append, delete, retrieve, search, update, and create database records. Also, SQL helps in the optimization and maintenance of databases. Therefore, it will be easier to have your own database instead of having tons of spreadsheets in data management and filtering out required data using SQL.
Another use of database is not only through storing personal information, addresses, etc. but also can be utilized for storing host records which can be very useful in network management for small and medium enterprises. If you already have a database that has host records, you can just use it (might be for security purposes) and integrate to your DNS server. Simple DNS Plus has plugins which fetch host records and optionally reverse records from your MS SQL Server, MS SQL Server Plus and MySQL Server to your DNS server. SQL queries are executed asynchronously or in a separate thread which therefore prevents other requests from slowing down when using this plugin. All you have to do in this plugin is to be able to execute an SQL query which returns the required data.