What is the difference beween Thalys and Eurostar?

Until 2023, Thalys and Eurostar were seperate brands under which high-speed trains in Western Europe ran. Thalys was the name for Amsterdam-Brussels-Paris and Germany-Brussels-Paris trains. 

From 2024 onwards, all Thalys trains have been rebranded as Eurostar. All international high-speed trains on former Thalys routes are now called Eurostar.