1. 或者 (huò zhě): This is the most common and versatile way to say "or". It can be used in most situations and is equivalent to "or" in English.
2. 还是 (hái shì): This is used when offering a choice between two options, and it is closer to "or else" in English. It is often used in questions like "Do you want this or that?"
Here are some examples:
* 你想吃米饭或者面条? (Nǐ xiǎng chī mǐfàn huò zhě miàntiáo?) - Do you want rice or noodles?
* 你是去上海还是去北京? (Nǐ shì qù Shànghǎi hái shì qù Běijīng?) - Are you going to Shanghai or Beijing?
Remember, the choice between 或者 and 还是 depends on the nuance you want to convey.