Informed consent is a process where individuals voluntarily agree to participate in research after understanding its purpose, risks, and benefits. It involves several key principles: consent should be informed, voluntary, and ongoing throughout the research. Researchers have a duty to properly convey information, avoid coercion, and allow participants to withdraw at any time. While written consent is ideal, oral or other culturally appropriate methods may also be used if properly documented. Exceptions to consent may be made only in minimal risk research where consent would make the study impossible. Challenges like lack of capacity, language barriers, or vulnerabilities require extra precautions to ensure proper informed consent.