Sparklines are small, data-intensive charts that can be inserted directly into cells within Excel. They provide a quick and condensed visual representation of trends and patterns in your data. With sparklines, you can easily create and display simple line graphs, column charts, or win/loss charts within a single cell, making it convenient to analyze and interpret data at a glance. Sparklines are useful for providing a concise visual summary of trends and variations in your data. They are particularly handy when you want to compare data across multiple cells or quickly identify patterns within a dataset.