A unilateral contract is a contract in which only one of the parties involved makes a specific promise to provide a service or carry out the terms of contract.Therefore the other party is under no obligation upon acceptance. This type of contract may relate to a business operation in which the party offering the service or specified promise is seeking to acquire business, either by proof of good performance or business values to the other party by carrying out the contract.
Examples of Unilateral Contract:
An offer to provide materials, goods or services with obligations upon the provider indicating good faith and positive values.
A special business arrangement involving benefits for the recipient at no cost.http://en.wikipedia.org/wiki/Contract
Unilateral contract of adhesion on timekeeping ticket dispensed by vending machine at parking lot entrance.