Cybersecurity significantly influences the software development lifecycle (SDLC) by ensuring that security is integrated at every phase, from planning to deployment and maintenance. Incorporating security practices, such as threat modeling and code reviews, helps identify vulnerabilities early on, reducing risks associated with attacks. This proactive approach leads to the development of secure software that protects user data and organizational assets. Moreover, ongoing security assessments and updates throughout the SDLC ensure that software remains resilient against emerging threats and compliance with regulations.