Hi Kavita, some of the roles and responsibilities of Graphic Designers are:
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Prepares visual presentations by designing art and copy layouts regarding arrangement, size, type size and style, and related aesthetic concepts. 
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Plans concept by studying information and materials. 
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Obtains approval of concept by submitting rough layout for approval. 
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Prepares final layout by marking and pasting up finished copy and art. 
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Ensures operation of equipment by completing preventive maintenance requirements; following manufacturer's instructions; troubleshooting malfunctions; calling for repairs; maintaining equipment inventories; evaluating new equipment. 
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Completes projects by coordinating with outside agencies, art services, printers, etc. 
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Maintains technical knowledge by attending design workshops; reviewing professional publications; participating in professional societies. 
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Contributes to team effort by accomplishing related results as needed.