Transfer what data from where to where? "Data transfer" is MUCH too large a topic to be addressed in a forum - it's about 12 months of coursework.
LOL!!!! data transfer is not a 12 month course lol, stop making your useless self seem important. --- as for the OP, by WP im assuming you mean wordpress. with wordpress it stores all your posts in a MySQL Database, when a page is loaded(assuming your not caching), it loads from the database. so for your diagram it would be... Blog >> New Post >> MySql Database Then User/Script requests Page >> creates page >> sends and displays page.