What are the different approval statuses for an approval record?

Each approval record has its own status field, which will change according to the approver’s actions.

Submitted - Waiting for action from the current approver.
Pending - Waiting for approval by other approvers after the current approver has been approved.
Rejected - If the current approver has rejected the approval. This sets the status in the related record from waiting for approval to rejected.
Auto-canceled - If the current approver rejects the approval, the record is set to auto-canceled to the next level approver.
Approved - If all the approvers have approved the record.

The above statuses are also viewable in the Approval widget of the related record.