Return on Investment (ROI) measures how profitable an investment is compared to its cost. Whether you’re choosing highest ROI investments for your portfolio or testing best ROI marketing strategies for your business, ROI helps you see where your money works hardest   Highest ROI Investments in 2025   Real Estate 🏡   Consistently delivers long-term growth.   Rental properties and house flipping can provide high cash flow.   ROI in real estate can be increased with property upgrades and smart financing.   Stocks & ETFs 📊   Growth stocks in technology, healthcare, and renewable energy are strong ROI drivers.  …