Journal of Cybersecurity and Information Management JCIM 2690-6775 2769-7851 10.54216/JCIM https://www.americaspg.com/journals/show/535 2019 2019 Assistant Professor (CS & IT) at Satish Pradhan Dnyanasadhana College, Thane Miss. Sayali Karmode Yelpale Cloud computing is being transformed into a model with services. It is mainly focused on the concept of dynamic provisioning, which is applied to services as well as to the capacity, storage, networking, and information technology infrastructure. This paper reviews the key concepts of cloud computing exist. We are presenting here various concepts of cloud computing. According to the previous few surveys we are presenting various security challenges and for that what solution are overcome. 2020 2020 36 45 10.54216/JCIM.040102 https://www.americaspg.com/articleinfo/2/show/535