RPA and test automation are different concepts for automating processes. RPA is used by business users to automate repetitive business tasks for improved productivity, while test automation is carried out by developers and QA teams to test software functionality before release. Key differences include their areas of focus (RPA is backend-focused while test automation validates front-end functionality), required technical skills (test automation requires programming skills while RPA is designed for non-technical users), and when they are used in the development lifecycle (test automation is used pre-release while RPA is post-release). Both can improve efficiency but have distinct purposes and specializations.