Dataframe

A dataframe is the workhorse data structure for analysis: a table held in memory with named columns, where each column has its own data type (numbers, text, dates) and all columns share the same length. It is what you get when you load a spreadsheet or CSV into tools like pandas (Python) or R.

The dataframe is powerful because it lets you operate on whole columns at once — filter rows, compute a new column, group and summarize — without writing loops. Beginners often treat it like a passive spreadsheet; thinking in column-wide operations instead is the key to fast, readable cleaning code.