WampServer

I have just installed WampServer (x64) in order to install a WordPress site. In localhost/phpmyadmin/ the Server connection collation is utf8mb4_general_ci. When I created a new DB, I defined the collation to be 'utf8_general_ci' However, when I installed the wordpress I looked back in my DB and all the tables are in collation utf8mb4_unicode_520_ci Why this was happened? I tried and
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