Formatter helps to transform a data from one format to another format, when working with many 3rd party platforms all may not follow a standard format to send data, for an example Zoom Webinar gives the date in 2021-03-25 21:26:42 where a date is stored in your Google Sheet will be like 23/06/21, now with the help of "Date & Time" formatter you will able to simply transform a date from one format to another to make it more human friendly as well as easy to compare for the systems.