Cloud solutions can be a lot of things.
You have cloud hosting for your website, Google Suite for your emails, file editing etc and there is also image hosting.
Image hosting is great if you have an image heavy site Amazon S3 works lovely with WordPress and it displays the image from a server closest to the user.
Cloud hosting is also the same so in theory the website will be served a lot faster to the user. Also this reduces the risk of potential downtime because your site is available in the cloud.
A great cloud solution for emails amongst other things is Google Suite. It allows you to have access to your emails, edit spreadsheets, edit documents have video and audio meetings and you get file storage too with access from any device.
If you need help with any of the above then let me know.