Broadly speaking, civil procedure consists of the rules by which courts conduct civil trials. "Civil trials" concern the judicial resolution of claims by one individual or class against another and are to be distinguished from "criminal trials," in which the state prosecutes an individual for violation of criminal law.
In the U.S., civil procedure usually takes the form of a series of rules and judicial practices. The federal courts follow the Federal Rules of Civil Procedure (FRCP); the state courts follow their own state rules of civil procedure. Often times, state civil procedure mirrors many of the federal rules.
CIVIL PROCEDURE, LEGAL INFORMATION INSTITUTE, https://www.law.cornell.edu/wex/civil_procedure (last visited June 1, 2020).