# Web Servers

Web servers can be of various types. Each one has a specific function, and hence a specific configuration. Let us read about some of the most common web servers.

**Application Server-** This server executes the main business logic of the application. Whenever the user requests for something, the application server runs the code written by the developer. 

**Database Server-** A database server is a system where all the data is stored. Whenever the user requests for some data, it is fetched from the database server. The data is stored here in an efficient and secure manner.

**Backup Server-** This server helps us create backups for files, data, etc. This is done to prevent the loss of data in case of an unexpected failure. A backup server can also act like the secondary server, in case the primary server is down. 

**DNS Server-** The Domain Name Server manages the domain names and their IP addresses. The main function of a DNS server is to map a domain name to its respective IP address. 

**Mail Server-** A mail server is used for sending and receiving emails. Some of the protocols used for this transfer are SMTP, POP, IMAP, etc. The Microsoft Exchange Server is an example of a mail server. 

Depending on the size of the web application, all these servers can be present on one physical server or on separate servers.


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