An attorney is a lawyer. Attorneys sue people, defend people, and serve as experts on the law.
When there's any kind of legal issue, attorneys will be involved. They're the legal experts with law degrees who are also known as "lawyers." You'll often find them in court, defending clients or trying to put criminals in jail. Attorneys work for businesses, schools, the government, and individuals. So if you get arrested, need to write a will, or have to hash out a binding contract, an attorney is the person to call.