Implied terms in English law

In English law, implied terms are default rules for contracts on points where the terms which contracting parties expressly choose are silent, or mandatory rules which operate to override terms that the parties may have themselves chosen. The purpose of implied terms is often to supplement a contractual agreement in the interest of making the deal effective for the purpose of business, to achieve fairness between the parties or to relieve hardship.

Source: Wikipedia — Implied terms in English law (CC BY-SA 4.0)