Up until
time, space, etc.
when combined with に, it denotes 'before the end of'.
５時までにお願いね。 Please do it before 5 pm.
Destination
also used to denote a destination (of an action). へ vs に vs で vs を
駅~~に~~歩く 駅まで歩く To walk until you reach/to the station
Frequently used to denote adresses, email, telephone number
お問い合わせは me@email .comまで送ってください。 Please inquire by email by sending it to me@email .com
ご相談は、下記電話番号までお電話ください。 For consultation, please call the number written below.
Before you reach (...)
Often used in the context of time.
明日までに電話をください。 Please call me before tomorrow.