Generally business can be categorized into two - product manufacturing and product related services. In fact the so famous IT sector in India is dominated by the second type of companies.
These companies provide some relevant utility to products from other companies. These services might across the spectrum from extending customer support after sale to even assisting the companies even before their product is released, Through some outsourced development or language translation etc.
These services are major ways of revenue stream and hence business model of many companies.
Read in Kannada: