The difference between thick client and thin client is:

• Thin clients:  When employing RPA tools, the thin client is an application that does not acquire specific properties. It primarily entails automating browser actions such as launching a browser, browsing to a webpage, and so on. It's software that's primarily built to interact with servers; for example, browsers require a constant network connection to function effectively.
  • The thin client software uses relatively few local resources such as disc, RAM, and so on.
  • Thin client software requires a fast network connection for functionality.
  • Since the data is stored on the server, it will not work if there is no server connection.
• Thick clients:  The thick client is an application that uses RPA tools to implement specific attribute characteristics (e.g., computer, calculator, Internet Explorer). It's a PIECE of software that implements its own features; it can connect to the server but will continue to function even if the connection is lost. 
  • In the CASE of thick client software, data is saved LOCALLY, thus it works even if there is no server connection.
  • Thick client software eats up more local resources such as disc space, memory, and so on.
  • The functionality is not reliant on the availability of a network connection.