Contracts can also be the source of legal disputes when they are not written clearly. Parties who misunderstand the terms of their agreement may sue each other and have a court settle the argument. Additionally, when a company signs a contract and later goes out of business or is unable to fulfill its promises, the other party may have to pursue legal action in civil or bankruptcy court to obtain relief.

If the contract is only partly written or the terms of the work are set out in a number of separate documents (email, quote etc.), it is to your benefit to make sure that any formal agreement you’re being asked to sign refers to or incorporates those documents. At the very least, make sure the contract doesn’t suggest that the formal document is the entire agreement.

2. Consideration: The exchange of offer and acceptance is the main subject matter of any agreement. The product or the service offered is the consideration for a promisee. Whereas a certain sum of money from the sale of goods or an agreed action or outcome is the desired consideration for a promisor.

3.Legality: This essential element is critical to ensure that the terms of the contract are compliant with the contract laws. These documents are subject to jurisdiction-specific law, where the parties perform their obligations.

4. Mutuality: Mutuality, also referred to as mutual assent or meeting of the minds, confirms that the parties to the contract clearly understand and agree to the terms of the contract. This helps to counter the issues of misrepresentation and ensures that both parties are bound to the agreement. Even if one party is not bound, the contract becomes void.

Unilateral contracts involve only one party promising to take action or provide something of value. These are also known as one-sided contracts, and a common example of them is when a reward is offered for something being found: the party to whom the reward is offered is under no obligation to find the lost item, but if they do find it, the offering party is under contract to provide the reward. 

Bilateral contracts, on the other hand, involve both parties agreeing to exchange items or services of value. These are also known as two-sided contracts and are the kind of contract that is most commonly encountered.

Option contracts allow a party to enter another contract with another party at a later time. Entering into a second contract is called exercising the option, and a good example of this is in real estate, where a prospective buyer will pay a seller to take a property off the market, then, at a later date, have a new contract made to buy the property outright, should they choose to do so.