Evidence is anything that you see, hear, or read that causes you to believe that something is true or has really happened.
We saw evidence everywhere that a real effort was being made to promote tourism.
There was no evidence of problems between them.
Evidence is an uncountable noun. Don't talk about ‘evidences’ or ‘an evidence’. However, you can talk about a piece of evidence.
The finding is the latest piece of evidence that vaccines can help prevent cancer.
It was one of the strongest pieces of evidence in the Crown's case.