When should Apex be used over Workflow rules or Process Builder in Salesforce?

Hi Achint,

There are some key differences between apex, workflow rules, process builder.

Workflow can perform only the following actions.

1. Update a field
2. Send an email
3. Create a Task

Send an outbound message (communication with another system)

Process builder have some extra features as:

1. Create a record (not just Tasks!)
2. Update related records
3. Launch a Quick Action
4. Post to Chatter
5. Launch a Flow
6. Call Apex code
7. Submit for approval
8. Invoke another process

And apex is for any kind of business requirement, like

1. Delete records
2. Update unrelated records
3. Share records with more complex criteria than Sharing Rules permits
4. Add/remove users in Chatter Groups and Public Groups
5. Create email templates that pull info from multiple records and Objects (combined with Visualforce)
6. And more