Days Sales Outstanding (DSO) is a measure of the average number of days that it takes a company to collect payment for a sale. DSO is often determined on a monthly, quarterly, or annual basis. The lower the DSO value, the better because it indicates that the company is collecting payments more quickly.There are several factors that can affect DSO including credit terms offered to customers, billing procedures, and collection efforts. It's important for companies to carefully monitor their DSO values and make changes as needed in order to improve cash flow and ensure healthy financial stability.