Wireless Controllers 100-105

in CCNA & CCENT
Hello does anyone know a good source of information about wireless controllers ? I am struggling to understand the concept. I sorta need a visual view of how it works. I understand that controller is basically like the overload that controls all the LWAPS/Minions, but that's about it lol.
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Why is a Controller required in a wireless network – excITingIP.com