Due to the absence of standards, vendor lockin is a significant obstacle to the adoption of cloud computing. The vendor lock-in issue is now being addressed mostly through technological means. There aren't many studies that analyze and show how complicated the vendor lock-in issue is in the cloud context. As a result, while purchasing services from vendors, the majority of clients are unaware of the proprietary standards that prevent application portability and interoperability. In-depth discussions of cloud concepts are covered in this paper, along with the causes of vendor lock-in problems and some preventative measures that can be taken. This is because many businesses are concerned about the possibility of becoming stuck with a vendor and being dissatisfied with the vendor's services.

Keywords : Cloud Computing, Vendor Lock-In, Cloud Models