wireless controller (what are they?)

in CCNA & CCENT
Can someone kindly tell me what is a wireless controller? I am going through the ccent 100-105 topics and don't really know what this is. Is it like a home wi-fi router?
Please help.
Thanks in advance!
Cheers,
-Benny
Please help.
Thanks in advance!
Cheers,
-Benny
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