Update all the child records when the parent record is updated | apex trigger

In this video you will learn how to update all the child record of parent if the parent record was update. This is a after update example of the apex trigger. In Salesforce, an after update Apex trigger is used to access field values that are set by the system and to make changes to other records after data is saved to the database. After update Apex triggers are read-only, and the records that fire them are also read-only.
The AFTER UPDATE trigger is helpful in scenarios where we want to record the time of status change or record changes in the rating field based on the modification in values of some other field etc.
Before Triggers are ideal for making changes to the triggering record, while After Triggers are suitable for working with related records and system-generated field values
Apex can be categorised into two main types based on events they respond to: Before triggers — They occur before records are saved to the database. They're used to update or validate records before they are inserted or updated in the database. After triggers — They occur after records are already saved to the database.

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