Recently, the Cloud Computing paradigm has significantly spread thanks to high-speed Internet connections, the standardization of digital technology and the wide adoption of mobile devices. The increasing usage of third-party cloud infrastructures poses considerable challenges in maintaining sensitive data confidential and processes trustworthy. As a result, several privacy-enhancing technologies have been developed, among which Confidential Computing aims to guarantee data protection in use. Among the various solutions proposed by Confidential Computing, Trusted Execution Environments (TEEs) succeed, offering a secure area where data and code can be securely processed and stored. Various TEE technologies from different vendors and with their specific implementations are now available.