i.e - "that is"
"i.e" is an abbreviation of a latin phrase meaning "that is".
It is used to explain something better or used as a "further" explanation of anything. It splits the complete sentence into two parts. The first part tells something, and the second part (following i.e) explain or elaborates it further. The use of i.e in a sentence clarifies it.
For example, we write a sentence "Our price includes service tax, i.e, you don't have to pay anything extra".