Contexts are a way of defining different sets of values for variables that are used in a job. For
example, you can define a context for testing and another context for production, with different
values for the database connection parameters, file paths, etc. You can then switch between the
contexts easily without modifying the job design. Contexts are not automatically defined by the
types of components used in the job, nor by Talend Studio. You must define the contexts yourself in
the Contexts tab of your job. You can also create context groups in the Repository and reuse them in
multiple jobs. Reference: Talend Data Integration — Software to Connect, Access, and Transform
Data | Talend,
