This should help...
https://support.chess.com/article/335-what-are-arena-tournaments
What exactly is Arena in Chess.com?
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Jan 13, 2020
0
#3
baddogno님이 썼습니다:
This should help...
https://support.chess.com/article/335-what-are-arena-tournaments
Thanks.
Mar 15, 2020
0
#4
Arena is a tournament which has a time limit! It does not follow the normal swiss pairing system and one player can get matched with another player more than once. The players are given points on the number of matches they win and they get more points if they maintain a streak. The one with the highest points after the end of the timer emerges winner!
There’s also the arena of 4 Player..
If yet had the opportunity, on your homepage your list bar the 
Play clicked directs you to.
I've heard the term a lot but don't know exactly what it is. Is it a tournament?