You can create custom patches, extensions, and upgrade baselines to meet the needs of your specific deployment by using the New Baseline wizard. You create and manage baselines in the Update Manager Client Administration view.
Update Manager also provides default baselines that you cannot edit or delete. Default baselines are the predefined baselines that contain patches for hosts and updates for VMs and virtual appliances. The other type of default baselines is the system managed baselines that you can use to check if your vSAN clusters run the latest supported software.