Beside what Misaki said there are many kinds of ما, but at this level you have to know some kinds like

interjection(ما التعجبية)

ما اجمل هذا اليوم
What a lovely day.

Question(ما الاستفهامية)

ما الذي فعلته البارحة؟
What did you do yesterday?

relative (ما الموصولة)

comes in the sense: الذي

اعجبني ما كتبته
I liked what you wrote

اعجبني الذي كتبته
I liked that you wrote

Adverb of time(ما الظرفية)

Indicate the continuation of time and come with one verb it is دام
and meanings similar to him like بقي, ظل

سأعمل خيرا ما دمت حيا
سأعمل خيرا ما بقيت حيا
ساعمل خيرا ما ظللت حيا
I will do good things as long as I alive

Somebody=شخص ما

When you add ما after a noun, it means "some..."

For example:

Somewhere=مكان ما

For some reason=لسبب ما

Thanks a lot, sham!

the purpose is an unknown thing or person or place ...

Nice saying