In an argument, an author’s opinion or position on an issue is called a claim. Generally, there is one main claim, which is what the author is trying to get you to think, change, or do. That claim is supported by reasons—the justifications used to support the claim. These reasons are supported by concrete evidence—facts, statistics, examples, expert opinions, definitions, or anecdotes.
Evidence can include facts, statistics, examples, expert opinions, definitions, or anecdotes. Identifying evidence can help you determine how well the author supported his or her reasons.