Imagine a game of poker, you buy in chips worth some amount held buy the casino. This buying in of chips is essentially opening up a channel, the casino is mostly a multi sig bitcoin address shared by whomever you’re opening a channel with.
Now you can play with those chips as much as you want make as many bets as you wants and whenever you want to close the game the final amounts are traded back with the casino. This is like the closing of the channel.
Not sure if I made a lot of sense, but it’s the closest analogy o could think of 😅