An example of a cloud storage service/provider is...

Data centers consist of servers, networking equipment, security and storage.

Files can be accessed from any device or location with an internet connection.

Cloud storage services typically operate on yearly or monthly subscription basis.

Files uploaded to reputable cloud storage providers are stored in data centers in an encrypted format.

When using cloud storage you have a limited control over your files.

An internet connection is required to access your files.

You do not need to be an expert to share and upload files to cloud storage.

Some cloud storage providers may not require their users to use 2FA, thus increasing the possibility of accounts being hacked. This raises security and privacy concerns (in case your files are leaked).

The storage limit of a cloud storage provider can be increased by upgrading the plan. In other words, one does not have to move any files from one storage device to another.

By using cloud storage one does not need to invest in secondary storage devices and to pay for the electricity powering them.

Reputable cloud storage providers have several backups of your files.