Vue de la construction du métro, chantier de la Tour Saint-Jacques, rue de Rivoli, 4ème arrondissement, Paris.

The Paris Métro, or simply the Métro, is the rapid transit system in Paris, France. It was first opened in 1900 and has grown to become one of the busiest subway systems in the world. Construction of the Métro began in 1898, and the first line opened on July 19, 1900. Since then, the Métro has expanded to include 14 lines and over 300 stations. The Métro is operated by the RATP (Régie Autonome des Transports Parisiens), a public transit authority that is responsible for the operation of public transportation in Paris. The Métro is an important part of the city's transportation network and is used by millions of people every day.

The history of the subway, or underground railway, dates back to the 19th century. The first underground railway was the Metropolitan Railway in London, which opened in 1863. It was proposed for London by Charles Pearson, a city solicitor, as part of a city-improvement plan shortly after the opening of the Thames Tunnel in 1843. The subway quickly became a popular mode of transportation in urban areas, as it allowed people to travel quickly and efficiently through the city. Over time, many cities around the world built their own subway systems, and today, subway trains are a common sight in many major cities. The technology used in subway systems has evolved over time, and modern trains are faster and more efficient than ever before.