Working capital is the money a company uses to cover its day-to-day expenses, like paying bills and buying inventory. It’s the difference between what the company owns that can be quickly turned into cash and what it owes in the short term. Healthy working capital means a company can easily pay its bills. If it’s low, the company might struggle to cover its costs.

https://www.investopedia.com/terms/w/workingcapital.asp