This document summarizes key parts of the Civil Code of the Philippines relating to contracts. It discusses the definition of a contract, characteristics of contracts such as their relativity and consensuality. It also categorizes different types of contracts based on aspects like name, perfection, cause, and obligatory force. The document outlines rules regarding stipulations in contracts, mutuality, determination of performance by third parties, effects on third persons, protection of creditors, inducement of breach, and requisites for a valid contract. It was prepared by Kristine N. Lungay as part of a summary of Articles 1305 to 1318 of the Civil Code pertaining to contracts.