Annotation is text set in a drawing to define a component or line and display its tag data and features. Annotations can be connected or unconnected to the component or line. Connected annotations will update if the component data changes. You can annotate components and lines to classify them as unique objects. Default tag formats are used for various components like equipment, valves, and pipes. These include tags for equipment type-number, valve code-number, and pipeline size-spec-service-line number. If complex tag formats are needed, the project manager may have modified the defaults.