mainly use when someone try to explain the Res on of something，u can translate as because,for example. l didnt go to school today because i have a cold .我今天没去上学，因为我感冒了。often be use with 所以.to say what reason cause what result.for example.因为我感冒了，所以我没去上学。

“因为” is a conjunction,it indicates "reasons" . We use it like” 因为……所以“. for example:①他与妈妈吵架是因为妈妈误解了他。②叶子的离去是因为风的猛烈还是树的不挽留。③我们之所以要努力学习是因为知识是一切之本。

just=because

It's completely the same as 'because' or 'because of'.

因为=because.