What does it mean to "watch" a tag?

I’m pretty new here. What does it mean to “watch” a tag? I already know how to do it, but i wanna know exactly what it does. Do i get notifications every time that watched tag is added to a post or is it something else? I’m confused…

@Bishop checkmate
On the front page, there’s a section at the bottom that shows images that have that tag.

You can further customize your watchlist here, for example to add exclusions.

@Bishop checkmate
You won’t get notifications, but anything that is included in your watchlist will appear in the my:watched query; think of it as the “subscriptions” page on youtube. And it’s not only singular tags that you can “watch”, you can also add complex expressions to your watchlist, in the section titled “Watch list search string”; for example if you want to “watch” images where both Sweetie Belle and Rarity appear, you can use (sweetie belle && rarity), and images that have both tags will appear in your “my:watched” query. For more information on expressions you can look at the search syntax page, you can add pretty complex tag combos if you are so inclined.

@The Smiling Pony
Thanks a lot! This really helped

@ArmadilloEater
Thanks a lot, this really helped! I might try tag combos later

@Bishop checkmate
No problem, don’t hesitate to ask if you want pointers with expressions.

Cheers!