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The exchange of business cards still plays very important role in aspect of connecting with people. It gives your business a face value and as the business card circulates so is your brand name gets into notice of clients and customer. A business cards also gives you and your business a trust value.
When you meet someone and you notice that he could be a potential customer or client, this is where you can grab the opportunity to introduce your business by an exchange of business card. Thou this is not an immediate profit or business but servers your business in long run. Having a business card also makes you look professional and recognize your business with standard values of professionalism.