JLink is a Java tool that enables developers to create smaller Docker images for their Spring Boot Java applications by assembling and optimizing modules and their dependencies into a custom runtime image. This reduces the size of the Docker image, leading to faster deployment, reduced storage costs, and improved security. By using JLink, developers can minimize the attack surface of their application, making it more secure. Additionally, Snyk is a developer security tool that can scan container images for vulnerabilities and provide suggestions on how to fix them. With JLink and Snyk, developers can create smaller, more secure Docker images for their Java applications.