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To provide a summary of org's security health, an administrator should run a Health Check that compares org's settings against baseline settings defined by Salesforce Security Baseline Standard or industry standards such as CIS (Center for Internet Security) Benchmark Standard. Health Check generates an overall health score based on how org's settings match with baseline settings for various security categories such as Password Policies, Network Access, Session Settings etc. Health Check also provides recommendations for improving org's security health score by adjusting settings that do not match with baseline settings. Changing Org-Wide Default to private, turning on Event Monitoring, or downloading user login data will not provide a summary of org's security health. Reference: https://help.salesforce.com/s/articleView?id=sf.security_health_check.htm&type=5

The AppExchange is an online marketplace where customers can find apps, components, consultants, developers, and more to extend Salesforce functionality or solve specific business challenges. Some of the actions that can be accomplished via AppExchange are finding certified developers and consultants who can help with custom development or implementation projects; installing industry-specific solution templates that provide preconfigured apps, dashboards, reports etc., for various industries such as manufacturing or healthcare; downloading free tools or components that enhance productivity or user experience; browsing reviews or ratings from other customers who have used certain products or services; etc. Reference: https://appexchange.salesforce.com/