Bounce Rate: Shows the percentage of visitors who enter the site and leave (bounce), rather than continue to view other pages, therefore, UEM visit deduction always start after the second action.
Conversion Goal: Configuring conversion goals is especially useful with e-commerce business applications where the conversion rate (spectator or buyer ratio) should be calculated. For example, if your web-site calls an
orderById method whenever a user orders an item, you can define a corresponding Methods - Invocation measure that identifies a conversion.
Review the below link for more insight.