주세요: Give me

When you ask something to be given, you can use "주세요". "주다" means give and adding "세요" makes it to be suggestion or asking.

- 사과(apple) 주세요.
: Give me apple

- 밥(rice) 주세요.
: Give me rice (often rice could mean food/meal).

It's 반말(casual) form is "줘"

- 사과 줘
: Give me apple.

- 밥 줘
:  Give me rice.

Sometimes, you can be in a situation where you need to use casual form but want to be nice. You can add "좀" before "줘" to make it nicer - it's somewhat similar to add "please" in english.
- 사과 좀 줘.
- 밥 좀 줘.
It's okay use "좀" in polite form, but it has less impact, as polite form is already polite.

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