Approval Process

An approval process includes the following elements:

• A name and description to distinguish it from other approval processes.
• Entry criteria if you only want records with certain attributes to be included.
• A designated user who can approve requests.
• Settings to specify who, if anyone, can change a record once it has been submitted for approval.
• Any number of steps that determine the sequence of actions to take when a record matches the criteria. Each step can have up to 40 actions, 10 of each type: email alerts, field updates, tasks, and outbound messages.
• Up to 40 additional actions that occur when a record is initially submitted.
• Up to 40 additional actions that occur when a record is approved.
• Up to 40 additional actions that occur when a record is rejected.
• Up to 40 additional actions that occur when a record is recalled.

For sending approval through email the following settings needs to be enabled .

Go to Setup--> Create ---> Workflow Approvals --->Settings and enable as shown below

Here one important things that should be kept in mind is that the User who approves on a certain object should have the correct permissions to do so. This can be done using Permission Set