A lookup relationship is a type of relationship that links two objects together, but the relationship is not required. This means that the child object can exist independently of the parent object. A lookup relationship can be either one-to-many or many-to-one, depending on the cardinality of the objects involved. For example, a contact can have a lookup relationship to an account, which means that a contact can belong to one account, but an account can have many contacts. Alternatively, a custom object can have a lookup relationship to a user, which means that a custom object can belong to many users, but a user can have only one custom object record. References: Trailhead: Data Modeling, Trailhead: Salesforce User Experience Designer Certification Prep, Salesforce Help: Define Lookup Relationships
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