What is the difference between tithe and offering?

What is the difference between tithe and offering?
And who should receive your tithes?

For tithe there is the estimation that we should give one of tenth but for offering there is no estimation we can give as much we want as our heart determines

Yep! And as the giver of those tithes and offerings, you should know how to tell them apart.

The tithe is the first 10 percent of your income that God calls you to give to your local church each month.
An offering is any money you choose to give above and beyond the tithe.

I think tithe and offering should not be confused because they have different connotations.Tithe expresses more of our response to God as part of special thanks.

i think offering is God’s teacing in Old Testament. We do not do it in now time.
Tithes, we need give Tithes to Church.
But i think this is confusing to explain for they are all teached in Old Testament.