What Is a Modem? Understanding Internet Connection Hardware #1487495 (License: Personal Use)

This illustration depicts a traditional external DSL or cable modem, featuring four LED indicators-typically for power, online/connection, data activity, and error/status-with alternating red and amber colors. The sleek gray casing and labeled "MODEM" text reflect consumer-grade hardware from the early 2000s to mid-2010s. Such devices served as the critical bridge between home networks and ISP infrastructure before integrated router-modems became standard.

Used on tech support pages, networking guides, or educational content explaining internet hardware fundamentals; targets users seeking to identify, troubleshoot, or replace legacy modems.