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what's meaning of '' prego''?

tell me what is the use of some prego

Hello Sewwandi,

It could mean different things:

1- It is an answer to someone thanking you meaning:
Don't mention it! ,You're welcome! Not at all!

2- Inviting someone to sit and it means then:
Please sit down!

3- Inviting someone to pass or go first :
After you!

Great answer, Cherry! =)
But there is another meaning of "prego". It could be the first singular person of the verb "pregare"(that means "to pray").
Prego Dio = I pray God
ciao!

Yes Fede :) and since you have mentioned the verb "pregare" it does have another meaning as well beside "to pray" it means "to beg or to ask".
pregare qn di far qc = to ask somebody to do something .

In this case :
ti prego = please ( where "prego" here is the first singular of the verb "pregare" as you mentioned)
Ti prego , do so and so