A Member of Congress (MC) is a person who has been appointed or elected and inducted into some official body called congress, typically to represent a particular constituency in a legislature. Member of Parliament (MP) is an equivalent term in other jurisdictions.
In the United States, the term Congress refers jointly to both houses of that country's national bicameral legislature, the Senate and the House of Representatives. Members of the Senate are typically referred to as "Senators," whereas members of the House of Representatives are referred to as "Representatives." Whereas the term Member of Congress applies to members of both houses, the terms Congressman and Congresswoman usually refer only to members of the House of Representatives.