A bilateral contract is an agreement where each party undertakes a binding obligation to the other, so that there is an exchange of mutual promises (for example, to supply goods and to pay the price). In legal practice in England and Wales, Scotland, Northern Ireland and Ireland, most commercial contracts are bilateral: both sides assume enforceable duties, as opposed to a unilateral contract where only one party is bound unless a specified act is performed.“Bilateral contract” is a descriptive term rather than a defined statutory category. Its core features, recognised in common law and case law across these jurisdictions, are: mutuality of obligation; agreement on essential terms; and consideration (or, in Scots law, cause) moving both ways. Typical examples include sale of goods contracts, services agreements, leases, employment contracts and most share purchase agreements.The term is used consistently in all four jurisdictions, although underlying doctrines (such as consideration in common law and the Scots law concept of promise) differ. Its practical significance lies in analysing formation, enforceability, remedies for breach, and issues such as repudiation, termination and specific performance where both parties owe continuing obligations.