What type of relationship do Account and Contact objects have?

The Account and Contact objects have a lookup relationship. A lookup relationship is a type of

relationship that links two objects together, but does not affect security, ownership, or deletion. A

lookup relationship allows the user to select a record from another object and link it to the current

record. For example, the Account field on the Contact object allows the user to select an account that

the contact is related to. A self relationship is a type of lookup relationship that links an object to

itself, creating a hierarchy of records. For example, the Reports To field on the Contact object allows

the user to select another contact that the contact reports to. A master-detail relationship is a type of

lookup relationship that creates a parent-child relationship between two objects, where the child

records inherit the security and ownership of the parent record, and are deleted when the parent

record is deleted. For example, the Account field on the Opportunity object is a master-detail

relationship that links the opportunity to the account.