There are many uses for creating multi-layer PDF documents such as show or hide information, view alternative views of product design or plans, etc. This feature lets the users control what content is displayed in the document which is quite unfamiliar with other text formats. This feature allows the content of the PDF document to be arranged in layers, which can be made visible or hidden dynamically by the consumers of the PDF viewer applications. As the name suggests, a PDF layer is a partial collection of text and images contained in a PDF document and the display of this content in the document can be made optional. PDF Layers formally known as Optional Content Groups(OCG) is a useful feature offered by the PDF file format.
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