A Lightning job typically refers to a task or role related to Salesforce Lightning, a framework for building user-friendly applications within the Salesforce ecosystem. It may involve developing Lightning components, customizing user interfaces, or optimizing application performance. Professionals in this field often work with Lightning Web Components (LWC) or Aura components to enhance Salesforce functionality. Responsibilities can include designing interactive features, improving user experience, and ensuring seamless integration with existing Salesforce applications.