Preconception care involves providing health interventions to women and couples before conception to improve health and reduce risk factors. It aims to secure optimal health for both parents to improve chances of conception and reduce risks of complications. Key components of preconception care include screening for nutritional deficiencies, genetic conditions, infections like HIV, and risk behaviors like tobacco use. It also involves health promotion, counseling, and treating existing conditions to help ensure women and their partners are healthy when they conceive.