phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields, manage privileges,export data into various formats and is available in 55 languages. 

phpMyAdmin can manage a whole MySQL server (needs a super-user) as well as a single database. To accomplish the latter you'll need a properly set up MySQL user who can read/write only the desired database. It's up to you to look up the appropriate part in the MySQL manual.

Currently phpMyAdmin can:

• browse and drop databases, tables, views, fields and indexes
• create, copy, drop, rename and alter databases, tables, fields and indexes
• maintenance server, databases and tables, with proposals on server configuration
• execute, edit and bookmark any SQL-statement, even batch-queries
• load text files into tables
• create¹ and read dumps of tables
• export¹ data to various formats: CSV, XML, PDF, ISO/IEC 26300 - OpenDocument Text and Spreadsheet, Word, Excel and L^AT_EX formats
• administer multiple servers
• manage MySQL users and privileges
• check referential integrity in MyISAM tables
• using Query-by-example (QBE), create complex queries automatically connecting required tables
• create PDF graphics of your Database layout
• search globally in a database or a subset of it
• transform stored data into any format using a set of predefined functions, like displaying BLOB-data as image or download-link
• support InnoDB tables and foreign keys (see FAQ 3.6)
• support mysqli, the improved MySQL extension (see FAQ 1.17)
• communicate in 55 different languages

A word about users:

Many people have difficulty understanding the concept of user management with regards to phpMyAdmin. When a user logs in to phpMyAdmin, that username and password are passed directly to MySQL. phpMyAdmin does no account management on its own (other than allowing one to manipulate the MySQL user account information); all users must be valid MySQL users.