The best known among the examples of what cloud computing is is SaaS . The acronym goes back to the concept in English: Software as a service . In this model, the user has access to applications without having to buy licenses, since the payment is charged according to the volume of use or the functionalities acquired.
Still don't understand what SaaS is ? In other words, it is an on-demand model where you pay for the application or the most available resources as long as they are useful to you.
An example of this is Microsoft's Skype . In it, the user can use the basic features of video calls for free. To do this, just have an email registered in a Microsoft account.
However, to use corporate features like group video conferencing and other services, you pay a specific amount for each additional feature for how long you use it.
Another example within this SaaS model is Google Drive . In it, in a similar way, the user has a free service referring to a reduced amount of cloud storage space.
The user can also hire paid corporate services with more resources and more storage space.
The advantage of this modality is that there is no need to purchase lifetime software licenses or concerns about hardware compatibility or upgrades.