Map projections and coordinate systems tell GIS software where to place data on a map.
There are two types of map projections:
Tips for finding data on the web:
When you georeference raster data, you define its location using map coordinates.
Make a color-coded map based on any of the columns in your attribute table.
To view the attribute table: Right click > Open Attribute Table
When you begin editing, if you receive a warning message about the coordinate system of the data layer not matching the data frame, you can change the coordinate system of the data frame:
The coordinate system of the data frame does not change the coordinate systems of the individual data layers. Rather, it changes how the data are displayed on the screen. You may see your data stretch and distort as you change the coordinate system of the data frame.