The Congress of the Philippines (Kongreso ng Pilipinas) is the legislature of the national government of the Philippines. It is bicameral, composed of a lower body, the House of Representatives, although colloquially the term "Congress" commonly refers to just the latter, and an upper body, the Senate. The House of Representatives meets in the Batasang Pambansa in Quezon City while the Senate meets in the GSIS Building in Pasay.
The Senate is composed of 24 senators half of which are elected every three years. Each senator, therefore, serves a total of six years. The senators are elected at-large and do not represent any geographical district.
In the current 19th Congress, there are 316 seats in the House of Representatives. The Constitution states that the House "shall be composed of not more than 250 members, unless otherwise fixed by law," and that at least 20% of it shall be sectoral representatives. There are two types of congressmen: the district and party-list representatives. At the time of the ratification of the constitution, there were 200 districts, leaving 50 seats for party-list representatives.
The district congressmen represent a particular congressional district of the country. All provinces in the country are composed of at least one congressional district. Several cities also have their own congressional districts, with some having two or more representatives. From 200 districts in 1987, the number of districts have increased to 243. Every new Congress has seen an increase in the number of districts.
The party-list congressmen represent the minority sectors of the population. This enables these minority groups to be represented in the Congress, when they would otherwise not be represented properly through district representation. Party-list representatives represent labor unions, rights groups, and other organizations. With the increase of districts also means that the seats for party-list representatives increase as well, as the 1:4 ratio has to be respected.