Faith is a uniquely Christian concept that means trust or complete confidence in something unseen. The term lacks a precise definition. In English the word comes from the Latin word "fidere", meaning "to trust".
The concept of faith does not exist in other major religions. While faith is mentioned 229 in the New Testament, faith is mentioned only twice in the Old Testament (KJV). In an English translation of the Koran (Islam), the concept of submission to Allah is mentioned 11 times, but faith in Allah is only mentioned once.
The term "faith" is often misused to describe the belief systems of other religions.