This document provides a tutorial on how to use custom filters in Google Adwords. It explains that custom filters allow users to sort through campaign, ad group, keyword, and other data to find specific details and areas for improvement. It then walks through the steps to create a custom filter, including selecting the column to filter, choosing filter parameters, and applying the filter. As an example, it shows how to create a filter to see keywords with a click-through rate over 5% that have generated at least one conversion. In conclusion, it encourages experimenting with different filters to optimize Adwords campaigns.