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In the Cloud Computing system, the concept of Multi-Tenancy is very important because IT provides the facility to all tenants through shared computer resources in a cloud environment. The cloud environment has two types: a public cloud environment and a private cloud environment. The tenant chooses one of the cloud environments. All tenant data is isolated and inaccessible to each other shown in Figure 2.3.

Figure 2.3 Multi-Tenancy models [5].

Multi-Tenancy cloud computing systems create a sparse work area for each tenant for storage or project data and login privacy policies. The tenant only uses their personal and secure area for work and accesses only know work or data. In the case of other requirements of data, another tenant’s permission or access key is required for access.

One type of cloud computing is in the private cloud environment and uses groups of more than two tenants belonging to a single company. They work on the same data and use resources through the cloud environment. The other type is the public cloud environment where many companies can share their data and services with different tenants. The public cloud environment is used more than the private cloud environment.

The Single Tenant Cloud Computing environment does not provide to all facilities. When compared to a Multi-Tenancy system, it provides more storage, access features, and security and privacy policies.

It provides a virtual environment for work easily, with less complexity maintaining work and hardware and no restrictions to devices or location [7].

Example of Multi-Tenancy with Cloud Computing:

Let us take a very common example of a colony. In a colony there are many houses; each house has many flats, each house is playing a role as part of a single company, each company has different departments, each department works only at their area, and each department shares common utility services (i.e. water, electricity, PNG etc.). Similar facilities are used by companies shown in Figure 2.4.

Figure 2.4 Multi-Tenant Cloud structure [6].