或者 is used in a statement while 还是 is used in a question. 你要吃草莓还是香蕉?- Do you want to eat strawberries or bananas? 你可以吃草莓或者香蕉? - You can have strawberries or bananas?

a或者b A or B - multiple possibilities a還是b is it A? or is it B? “或” most corresponds to our "or", you will often see this single character in a sentence like A (或：B) in spoken language they say 或者 (huo2zhe3) as i undersatnd it, if you use the meanings in the same sentence, the meanings change like this: 你想吃麵 或者 飯 you want to eat noodles or rice! 你想吃麵 還是 (想吃)飯 do you want to eat noodles? "or is it" （還是) rice (that you want)..... notice that chinese speakers don't add 嗎 in this style of question, because "還是" is a signal to the listener that you are unsure which is the case, implicitly asking the other party a question, so 嗎 becomes unnecessary. (The same is true for things like 什麼, I never hear: 你想要什麼嗎， only 你想要什麼?. ） (I hope if I am wrong, a native speaker will correct or clarify)

hi 1 “或者”表示肯定（to be sure） 2“还是”表示疑问，用在疑问句（we often use interrogative sentence） For example：我们吃米饭还是吃面包? 我们吃米饭或者面包。

thats a tough question, have no idea how to explain...: