This document summarizes key concepts related to contracts under Philippine law. It outlines the stages in the life of a contract, characteristics of contracts, types of contracts, and essential elements of a valid contract. Key points include: contracts are perfected through consent, they impose mutual obligations on parties, and they can be classified in various ways including bilateral/unilateral and consensual/real. The document also discusses capacity to contract, defects that may affect a contract's validity or enforceability, and methods of termination or perfection.