PhpMyAdmin is a tool to manage MySql databases over the internet.You can perform all kind of database operations using this tool through http request.PhpMyAdmin also provides and acts as front end interface of the MySql database
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This step by step tutorial will show you how to turn on 2 Factor verification in Gmail which is OFF by default . In my opinion , this feature is very useful for users as it prevents from hacking .Google will ask you for a code , if you try to login from a different location(browsing centre etc) than the one you setup
The most important part of increasing the webpage performance is to reduce the number of http requests,Which can be achieved by CSS Sprites.Sprite images require single http request to load the sequence of images but usually the sprite images are somehow difficult to construct and there is no automated tool available.Data URI is the alternate way of performance improvement instead of css sprites