The cloud is a metaphor for a global network of remote servers that operates as a single ecosystem, commonly associated with the Internet. Source: Microsoft Azure
Simply put, the cloud is the Internet—more specifically, it's all of the things you can access remotely over the Internet. When something is in the cloud, it means it's stored on Internet servers instead of your computer's hard drive. Source: GFCGlobal
You can use a cloud account to share files between your internet-connected devices.
Documentation is the key, the key, the key
Carefully record your cloud account username and password — and take a few moments to understand what your cloud account is for.
Quotation
Clouds come floating into my life, no longer to carry rain or usher storm, but to add color to my sunset sky.
Rabindranath Tagore