our industry, many of which present similar non-GAAP financial measures to investors, and to analyze our cash performance. However, the non-GAAP financial measures presented may not be comparable to similarly titled measures reported by other companies due to differences in the way that these measures are calculated. These non-GAAP financial measures are presented for supplemental informational purposes only and should not be considered as a substitute for or in isolation from financial information presented in accordance with GAAP. These non-GAAP metrics have limitations as analytical tools.
Non-GAAP Gross Profit and Non-GAAP Net Loss
We define non-GAAP gross profit and non-GAAP net loss as GAAP gross profit and GAAP net loss excluding the impact of stock-based compensation, and payroll tax expense related to stock-based activities. We believe the presentation of operating results that exclude these non-cash or non-recurring items provides useful supplemental information to investors and facilitates the analysis of our operating results and comparison of operating results across reporting periods.
Adjusted EBITDA and Adjusted EBITDA Margin
We define Adjusted EBITDA as our net loss excluding: (1) depreciation and amortization; (2) interest income, net; (3) stock-based compensation; (4) income tax expense; and (5) payroll tax expense related to stock-based activities. We define Adjusted EBITDA Margin as Adjusted EBITDA divided by revenue.
Free Cash Flow
Free Cash Flow is a non-GAAP financial measure that we calculate as net cash used in operating activities, less cash used for purchases of property, equipment, and software, and capitalized internal-use software costs. We exclude purchases of property, equipment and software, and capitalized internal-use software costs as we consider these capital expenditures to be a necessary component of our ongoing operations.
Reconciliations of the non-GAAP measures to the most directly comparable GAAP financial measures are included in the Appendix.
Special Note on Forward-Looking Statements
This press release contains forward-looking statements that involve substantial risks and uncertainties. Any statements contained in this press release that are not statements of historical facts may be deemed to be forward-looking statements. In some cases, you can identify forward-looking statements by terms such as: “accelerate,” “anticipate, “believe,” “can,” “continue,” “could,” “demand,” “estimate,” “expand,” “expect,” “intend,” “may,” “might,” “objective,” “ongoing,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would,” or the negative of these terms, or other comparable terminology intended to identify statements about the future. These forward-looking statements include, but are not limited to, statements regarding: the urgency with which companies, campuses, and governments around the world are investing in new and digital skills; the growth of our Professional Certificates portfolio; the rising demand for role-based learning among institutions; our ability to fulfill demand for role-