Most contracts can be classified as.

Most contracts can be classified as bilateral because a bilateral contract involves mutual promises between two parties where each party agrees to fulfill their part of the deal. For instance, in a typical sales agreement, one party promises to deliver goods while the other agrees to pay for them. This reciprocity of obligations is a defining characteristic of bilateral contracts, making them the most common type in business and law.

While unilateral contracts exist, in which only one party makes a promise that the other party can accept through action (like a reward for finding a lost pet), they are less frequently encountered in everyday transactions compared to bilateral contracts. Written and oral classifications refer to the format of the contract rather than the nature of the promises made, and while both written and oral contracts can be bilateral, they do not inherently define the predominant type of contract in general. Therefore, the classification of most contracts as bilateral reflects the standard practice in contractual agreements.