Generally, a docking station for ThinkPad offers these benefits:
Increased Connectivity: Docking stations offer a wide range of ports via a single connection, extending the connectivity options of your ThinkPad. This includes additional USB ports, audio jacks, HDMI or DisplayPort outputs, Ethernet ports, and more.
Multi-Monitor Support: A docking station can help you achieve multiple monitor displays easily. Many docking stations like the Anker 777 Thunderbolt Docking Station support dual or even triple monitor setups, allowing you to extend your laptop's display across external screens.
Charging and Power Management: Some docking stations can charge your ThinkPad while it's connected, which means you don't have to worry about battery life during prolonged use.