Before trigger and After trigger in salesforce | apex trigger | salesforce development

In Salesforce, triggers are pieces of Apex code that execute automatically in response to certain events on a record, such as insert, update, delete, or undelete. These triggers can be classified into Before Triggers and After Triggers, each serving different purposes within the Salesforce execution flow.
1. Execution Timing
Before Trigger: Executes before the record is saved to the database.
After Trigger: Executes after the record has been saved to the database.
2. Purpose
Before Trigger: Primarily used for data validation and manipulation. This is where you can make changes to the record's field values before they are committed to the database.
After Trigger: Primarily used for actions that require the record's ID or other database-generated values, such as creating or updating related records, sending notifications, or making callouts to external services.
3. Access to Record IDs
Before Trigger: The record does not have a database ID (Id field) yet because it hasn’t been saved. You cannot use the record ID or perform operations that rely on the record being in the database.
After Trigger: The record is already saved, so you can access its database ID (Id field) and perform operations that depend on the record existing in the database.
4. Common Use Cases
Before Trigger:
Data Validation: Ensure certain criteria are met before the record is saved.
Data Transformation: Modify the values of fields before the record is saved

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