To be legally enforceable, a contract must meet the following requirements:

Offer and acceptance (A): One party must propose terms, and the other must agree to them.

Competent parties (B): Individuals must have the legal capacity to enter a contract (e.g., not minors or mentally incapacitated).

Consideration (C): Each party must provide something of value (e.g., money, services, or promises).

Written evidence (D) is not required for all contracts, as some verbal agreements are enforceable depending on the type of contract (except for specific cases like real estate).