A filter is used to zoom in on a particular part of a data set or database. For example, if you only want to study first-time visitors of your website, you could filter your report such that visit number equals one. A filter can be applied on different levels: on a global level, on a local level (table filter) or directly on the rows or columns of a table. A filter applied on a higher level will always also work on a lower level, whereas the opposite is not true. It is possible to use several different filters in your analysis. For example, it is possible to filter out all traffic stemming from your colleagues via IP addresses while at the same time zooming in only on those visitors who enter your website through the home page. In this case both a global filter and a local (table filter) are used.