What is a Data Lens page and how do I create one?

Data Lens is the new way for the public to visually explore data.  A Data Lens page may consist of several cards that display data in a variety of different ways using column charts, distribution charts, timelines, choropleth maps, or point maps.  Once created, the individual cards serve as cross-filters, as shown below.  Just click specific values in one or more cards, and the page filters the rest of the cards as well as the data table based on those conditions.  For text columns, you can also use a search card, which provides the public a list of options once they start typing.  When they select an option, the data table is filtered to display the appropriate records.