It is added to adjectives to form adverbs, usually describing how something is done or the manner in which something happens.
Here are some examples:
* Beautiful (adjective) -> Beautifully (adverb)
* Brutal (adjective) -> Brutally (adverb)
* Careful (adjective) -> Carefully (adverb)
* Efficient (adjective) -> Efficiently (adverb)
* Formal (adjective) -> Formally (adverb)
Exceptions:
While "-ally" is a common adverb-forming suffix, it's important to note that not all words ending in "-ally" are adverbs. Some words ending in "-ally" are adjectives (e.g., "generally," "actually").