International Journal of Web Applications Aleksandar Bahtovski and Marjan Gusev 14 4 2022 https://doi.org/10.6025/ijwa/2022/14/4/81-86 https://www.dline.info/ijwa/fulltext/v14n4/ijwav14n4_1.pdf The domain Cloud Computing has emerged as a unique discipline characterized by the crucial features such as virtualization and pay-by-use. However, the field cloud computing has many unresolved issues. One such important problem is in the interoperability. In this paper we describe a few interoperability standards and the causes for its deployment. Mobile computing with three systems of models are also explained in this study.