Ablative
/ˈæblətɪv/
Definition 1 of 6
Pro Tip 1/3Case Usage
Understand that ablative often indicates the means or manner how something happens in a sentence. 
He wrote the letter with a pen - 'with a pen' is an ablative explaining the means.
Pro Tip 2/3Not Always Objects
Remember, in some languages, ablative is used for locations or causes, not just direct objects. 
In Latin, 'Romā venit' means 'He comes from Rome', where 'Romā' is ablative.
Pro Tip 3/3Latin Focused
In English, we don't have an ablative case; it's more common in Latin-based linguistic studies. 
When studying Latin, you'll frequently encounter the ablative case.