Use cases for Apex Triggers:

Apex Triggers can be used for a wide range of business requirements in the Salesforce platform. Here are some common use cases for Apex Triggers, along with examples and a point-wise explanation:

Data Validation:

Before Triggers can be used to enforce data validation rules, such as ensuring that certain fields are populated before a record is saved, or to automatically populate fields based on other field values. 

For example – a Before Trigger could be used to validate that the Account Name and Industry fields are populated before a new Account record is saved.

Field Updating: 

Triggers can be used to update fields based on changes to other fields or to update fields based on changes to related records. 

For example – an After Trigger could be used to update the Opportunity Stage field based on the Probability field, or to update a custom field on the Account record based on changes to related Contact records.

Record Auditing: 

Triggers can be used to track changes to records, such as logging changes to a custom audit record or sending notifications when a record is modified. 

For example – an After Trigger could be used to log changes to a custom audit record every time a Contact record is modified, or to send a notification when an Opportunity is won or lost.

Workflow Automation: Triggers can be used to automate business processes, such as updating related records or sending notifications.

For example, an After Trigger could be used to update a custom field on the Account record when an Opportunity is won, or to send a notification when a Lead is converted to an Account, Contact, and Opportunity.

Data Integration: 

Triggers can be used to integrate data between Salesforce and other systems, such as updating records in an external database or sending data to an external system for processing.

For example – an After Trigger could be used to update records in an external database every time a Lead is converted to an Account, Contact, and Opportunity, or to send data to an external system for processing every time a new Opportunity is created.

Performance Optimization: 

Triggers can be used to optimize the performance of Salesforce, such as bulkifying trigger logic to reduce the number of database operations or caching data to reduce the number of database queries. 

For example – a Before Trigger could be bulkified to process multiple records at once, reducing the number of database operations, or to cache data in a custom object to reduce the number of database queries.