The document summarizes four automation use cases presented by various Salesforce MVPs at a Process Automation Showdown event. The use cases include: 1. Using Process Builder and a Flow to delete inactive contacts and their related cases while keeping data intact for reporting. 2. Using Process Builder to update sibling records and mark the most recent activity on an account for reporting purposes. 3. Using a Flow to loop through and count open cases on an account to roll up the total to a custom field on the account using Process Builder. 4. Using Process Builder and invocable Apex to automatically convert marketing-qualified leads when their rating is set to "Hot".