This is the 53rd most frequent German word.
alle
"Alle" means "all" or "everyone" in English.
Here, 'alle' is used as a determiner meaning 'all' to quantify the noun 'Tiere' (animals).
Alle Tiere im Wald sind heute aktiv.
All the animals in the forest are active today.
In this sentence, 'alle' is a pronoun meaning 'everyone,' referring to a group of people doing an action collectively.
Alle gehen zur Party morgen.
Everyone is going to the party tomorrow.
Here, 'alle' is used as an adjective determining 'Farben' (colors), implying the entirety of the set.