What is the difference between SSL VPN and IPSec VPN?

This statement is the opposite of reality - IPSec VPN does require installation of a resident VPN client on the endpoint device to negotiate and maintain the tunnel.

This is factually incorrect - the primary advantage of SSL VPN is that it does not require a resident VPN client, relying instead on a browser's native TLS support.

SSL VPN and IPSec VPN are distinct technologies operating at different OSI layers - SSL/TLS operates at the application layer while IPSec operates at the network layer, and they differ significantly in client requirements and deployment complexity.

IPSec VPN establishes tunnels at the network layer and requires a dedicated VPN client application (such as Check Point Endpoint Security VPN or Cisco AnyConnect) to be installed and running on the user's device. SSL VPN leverages the TLS/HTTPS protocol already built into web browsers, enabling clientless or thin-client remote access where only a browser - or a lightweight browser plug-in - is needed.