A CSV file is a “comma-separated values” file. In plain English, this is a text file that contains an unusually large amount of data. More often than not, this is used in order to create databases of information, where each unit of data is separated by a comma. Hence the name!
Being able to manipulate, load, and store large amounts of data is a hugely beneficial skill when programming. This is particularly true in Python, seeing as Python is such a popular option for machine learning and data science.