Ante- and pre- BOTH mean before/prior/earlier. Pre- is the commonest prefix (pre-fix!), but ante- forms the start of many interesting words. Ante-room (a room or chamber before you get to the main room, often found in palaces and tombs), antediluvian (before the flood!), and words such as anterior/posterior have that ante/post start... though they are not really prefixes here. There's a common saying "to up the ante." The ante is the money to put down in advance in a bet. In a high stakes poker game, or in a risky situation, you can... up the ante! (bet more, or increase the risk/danger/stake) So 'ante' has a lot of meanings associated with before/at the front/in advance. However it is not always a prefix exactly. It is simply part of the word. And there are some words that start ante... that have nothing to do with being before/first/earlier. How about ... anteater! This is not an ante-ater... it's an ant-eater. It eats ants.

Pre = before Ante = after For example: Prenatal - before the baby is born Antenatal - after the baby is born

They both mean before. Pre- is more commonly used. Prenatal and antenatal mean the same thing. Antenatal is more commonly used in British English, prenatal in American English. normally the prefixes are not interchangeable.

My main answer is for more advanced students. For you, here, I have a simple answer. They are the same. Pre- is more common. Simple!