Frequency: The word is one of the 1500 most common words in English.
1.
You use obviously when you are stating something that you expect the person who is listening to know already.
Obviously, they've had sponsorship from some big companies...
There are obviously exceptions to this.
= clearly
ADV: ADV with cl [emphasis]
2.
You use obviously to indicate that something is easily noticed, seen, or recognized.
They obviously appreciate you very much...
ADV: ADV with cl/group