They provide network address translation (NAT) functionality, so multiple users can use the internet with a single public IP.
[1] It also acts like a dynamic host configuration protocol (DHCP) to assign IPs automatically to devices connected to the network.
[2] This converged device saves desk space and simplifies wiring by replacing two electronic packages with one.
However, most internet providers offer a free wireless gateway with their services, thus limiting the user's choice.
Another advantage of using these devices is the ability of the company to troubleshoot and fix any problem via remote access, which is very convenient for most users.