Lobbying is a form of advocacy that legally attempts to influence legislators or government officials, such as members of regulatory agencies or the judiciary. Lobbying involves direct, face-to-face contact and is carried out by various entities, including individuals acting as voters, constituents, or private citizens, corporations pursuing their business interests, nonprofits and NGOs through advocacy groups to achieve their missions, and legislators or government officials influencing each other in legislative affairs.
Lobbying or certain practices that share commonalities with lobbying are sometimes referred to as government relations, or government affairs and sometimes legislative relations, or legislative affairs. It is also an industry known by many of the aforementioned names, and has a near-complete overlap with the public affairs industry. Lobbyists may fall into different categories: amateur lobbyists, such as individual voters or voter blocs within an electoral district; professional lobbyists who engage in lobbying as a business or profession; and government relations support staff who work on behalf of professional lobbyists but may not actively engage in direct influencing or face-to-face meetings with targeted individuals to the extent required for registration as lobbyists, operating within the same professional circles as registered lobbyists.