"The cloud" refers to servers that are accessed over the Internet, and the software and databases that run on those servers. Cloud servers are located in data centers all over the world. By using cloud computing, users and companies do not have to manage physical servers themselves or run software applications on their own machines. Read more on Cloudfare
There are many uses of the cloud by Day One, including SaaS(Software as a Service), IaaS(Infrastructure as a Service), test and deployment, cloud storage, hosting and so much more. If all the aforementioned sounds confusing just read this article by IBM that details all the use cases listed here and more
The cloud allows Day One to operate with efficiency and reduced DevOps overhead costs. This means you as a Resident get the most out of your deal without having to worry about an endless of fees. The cloud when combined with a NoSql database scales vertically, in other words we are able to keep up with the ever increasing number of new sign ups each day, each minute. To get more clarity we recommend this article by IBM
Every reputable cloud service provider (CSP)-the business or entity that owns and operates the cloud offers basic security, including encryption.Cloud encryption is the process of transforming data from its original plain text format to an unreadable format, such as ciphertext, before it is transferred to and stored in the cloud. As with any form of data encryption, cloud encryption renders the information indecipherable and therefore useless without the encryption keys. This applies even if the data is lost, stolen or shared with an unauthorized user. this extract is cite from Crowdstrike, read the entire article here