Yes, Accounts Receivable (AR) is a source of asset. It is the money that your customers owe you goods or services that you have provided and your customer has not paid yet.
As an illustration, when a company sells goods on credit, the sum of money that the customers are owed is called Accounts Receivable. It appears in the current assets section of the balance sheet since it is likely to be converted to cash in the near future.
The AR in a nutshell gives the projection of cash flow in the future and assists in determining the liquidity and financial status of a business.