Users typically frequent these platforms for several key functionalities:

: After the original site was shut down in March 2018, dozens of "mirror" and "clone" sites like HDMovies123 appeared to fill the void.

The "123" brand began in Vietnam around 2015 and quickly grew into what the Motion Picture Association of America (MPAA) once called the "world's most popular illegal site".

The term refers to a prominent network of third-party streaming sites that offer free access to movies and television shows without subscription fees. Originally emerging as a successor or "mirror" to the legendary 123Movies , these platforms became famous for providing high-definition (HD) content and a user-friendly interface that mirrored premium services like Netflix.

However, despite their popularity, sites like HDMovies123 operate in a legal gray area—often facilitating copyright infringement and exposing users to significant cybersecurity risks. The Rise of the "123" Streaming Empire

: At its peak, the original network served nearly 98 million active users monthly.