The Serverless Snyk plugin is a plugin for the Serverless framework that helps prevent vulnerable packages in applications, using Snyk's vulnerability scanning and patching capabilities. It seamlessly integrates into the deployment process, automatically scanning for known vulnerabilities, applying patches and upgrades, and monitoring dependencies for proactive alerting of new vulnerabilities on each deploy. The plugin can be easily installed by running npm install serverless-snyk --save, and its configuration is handled through a serverless.yml file. With the plugin, developers can focus on building their application while having automated security protection against known vulnerabilities in their dependencies.