Refers to the person or organization hosting a party, summit, TV show, or similar event.
He acted as the host of the party.
He served as host of this year's summit.
The host country of the summit is Japan.
male host (at a host club)
Specifically refers to a male employee who entertains female customers at a host club (ホストクラブ).
He works as a host in Shinjuku.
He became a host to pay off his debts.
The host entertained the invited guests.
ホスト is the person hosting an event, while ゲスト is the guest who attends it.
ホスト is a male entertainer at a host club, while ホステス is the female equivalent at a hostess bar.
Borrowed from English 'host'.
host system