LAMBDA lets you turn repeated Excel logic into reusable functions that update automatically across your entire workbook.

As of April 2026, Microsoft Excel's Copilot has evolved beyond simple formula generation into a full 'Agent Mode' capable of multi-sheet reasoning and live data interpretation. This shift means a ...

Daniel Jassy, CFA, is an Investopedia Academy instructor and the founder of SPYderCRusher Research. He contributes to Excel and Algorithmic Trading. Return on investment (ROI) measures the amount of ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...