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Cloud deployment models define how cloud services are made available and used. Each model offers different levels of control, security, and flexibility. The main models are Public, Private, Hybrid, and Multi-Cloud.
Public cloud: Offered over the internet and shared among multiple organizations, managed by a third-party provider. Example: AWS virtual servers and storage. Public clouds are cost-effective but less secure.
Private cloud: Used exclusively by one organization, hosted on-premises or by a third party, not shared. Example: a bank holding sensitive customer data. Private clouds are more secure but expensive.
Hybrid cloud: Combines public and private clouds so data and applications can be shared. Example: everyday work on the public cloud, sensitive data on the private cloud, with extra load moved to the public cloud when busy. Hybrid clouds offer flexibility.
Multi-cloud: Uses several providers at once (AWS, Azure, Google Cloud) for different needs. Example: a retailer using AWS for the website, Azure for ERP, and GCP for analytics. Multi-clouds provide resilience.
Comparison: Public clouds are cost-effective but less secure. Private clouds are more secure but expensive. Hybrid clouds offer flexibility, while multi-clouds provide resilience.