A complete picture of a group of assets currently running in your cloud account. Each of these services reflects a single project/account/subscription within AWS, Azure or GCP. Each service discovery can have as many versions as you would like.
A version is a diagram and technical documentation of the infrastructure at a specific point in time. You can generate a new version whenever you want a fresh picture or schedule auto-crawl. Versions are kept until you choose to delete them.
Relevant data to your Service Discovery are: regions and services crawled, and an Issue Only CSV to download.
This is a Visual Service Discovery: