According to the Council on Tall Buildings and Urban Habitat (CTBUH)'s official definition and ranking, they were the tallest buildings in the world from 1998 to 2004 and remain the tallest twin towers in the world. The buildings are a landmark of Kuala Lumpur, along with nearby Kuala Lumpur Tower.

The towers were designed by Argentine architect Cesar Pelli. A distinctive postmodern style was chosen to create a 21st-century icon for Kuala Lumpur. Planning on the Petronas Towers started on 1 January 1992 and included rigorous tests and simulations of wind and structural loads on the design.

Tower One is fully occupied by Petronas and a number of its subsidiaries and associate companies, while the office spaces in Tower Two are mostly available for lease to other companies. A number of companies have offices in Tower Two, including Huawei Technologies, AVEVA, Al Jazeera English, Carigali Hess, Bloomberg, Boeing, IBM, Khazanah Nasional Berhad, McKinsey & Co, WIPRO Limited, TCS, HCL Technologies, Krawler, Microsoft, The Agency (a modelling company) and Reuters.

The service building is to the east of the Petronas Towers and contains the chiller plant system and the cooling towers to keep the Petronas Towers cool and comfortable. In order to visit Petronas towers, visitors must first purchase tickets. Tickets can be purchased online or at the counter.

According to wikipedia