aspg-2-535-1791951399 20261014041639 American Scientific Publishing Group admin@americaspg.com American Scientific Publishing Group Journal of Cybersecurity and Information Management JCIM 2769-7851 2690-6775 2020 4 1 Miss. Sayali Karmode Yelpale Assistant Professor (CS & IT) at Satish Pradhan Dnyanasadhana College, Thane 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 36 45 535 https://creativecommons.org/licenses/by/4.0/ 10.54216/JCIM.040102 https://americaspg.com/journal/2/article/535 https://americaspg.com/storage/5258.pdf