Nice answer
\tFormal sources follow the sources of credit that are registered by the govt. and have to follow its rules and regulations whereas in informal sources include those small and scattered units which are largely outside the control of the government.\tRBI dominates the functions of formal sources of credit but in informal sources there is no organisation that dominates the credit activities.\tFormal sources usually charges lower rates of interest whereas in informal sources they charge much higher rates of interest.\tThe main motive of formal sources is social welfare whereas the main motive of informal sources is profit-making.\tBanks and cooperatives are the example of formal sources and moneylenders, traders, employees, friends and relatives etc are the example of informal sources.