What is different between MySQL server and MySQL client?

[nguyenchiemminhvu (NCMV)]

I launch Ubuntu Software Center and looking for MySQL, the result included MySQL Workbench (i know this application), MySQL server and MySQL client. But then, i access main page mysql.com, i just saw the way to download MySQL community server.

So what is main purpose of twoo different application? What is different between MySQL server and MySQL client?
How two application interactive to each other?
When we use MySQL server, and when we use MySQL client?

[jackvo]

MySQL server was used when you want to deploy a website or an application which stores the data in a database.

MySQL Client only was used to connect to MySQL Server and run SQL statement to query/modify the data in database.

Actually, you can use any SQL client support various database type, not only MySQL but also Oracle, DB2, Sybase, MSSQL …