The World Welterweight Championship is a prestigious boxing title contested by professional fighters in the welterweight division, which includes boxers weighing up to 147 pounds (66.7 kg). This championship is recognized by major boxing organizations, such as the WBC (World Boxing Council), WBA (World Boxing Association), IBF (International Boxing Federation), and WBO (World Boxing Organization). Fighters compete for the title through a series of matches, culminating in a championship bout. The titleholder is often regarded as one of the best in the division, and successful defenses can enhance a boxer's legacy. Notable champions in this weight class include Manny Pacquiao and Floyd Mayweather Jr..