Merge, Join, and Concatenate

In this lesson, we will learn how to work with multiple DataFrames in Pandas. Using merge(), join(), and concat(), we will understand how to combine different datasets, how key columns work, and the differences between inner, left, right, and outer joins through practical examples. ## Lesson objective In this lesson, we will learn how to combine multiple DataFrames in Pandas. In the previous lessons, we mainly worked with one DataFrame. We read data, filtered it, cleaned it, created new columns, and created summary results with groupby. However, in real data analytics, data is often not stored in one file.