Will the mysql database encoding (character_set_database) andserver encoding (% _server) What's the difference ?

There is also a client encoding : character_set_client;

server code , what is to say that the content is to use that encoding it .
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intellij try
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character_set_server: mysql installation specified default character set.
character_set_database: mysql in a database character set used , if not specified when creating a library character set , the value will be used character_set_server default settings .
character_set_client: is Mysql client , is that the command line window MySQL Command Line Client character set
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someone to help solve this problem Mody. Thank you .
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who will answer this question, I would like to quote a knot . What difference does this in the end .