A layer file in ArcGIS Pro has a .lyrx file extension. They store all the property settings associated with a layer in a map such as a source, symbology, field visibility, labeling, definition queries, and more. Layer files allow you to standardize these settings so the layer will appear the same across multiple maps and projects.
Using a layer file to add a new layer uses the same process as adding a layer using a feature class. However, instead of choosing a geodatabase, shapefile, Computer-Aided Design (CAD) file, or raster, you select the layer file instead. When you do that, your layer will be added to your map with all the properties preconfigured, so you don't need to go back and set all the layer properties manually. This can save you valuable time.
Layer files created in ArcMap may also be used in ArcGIS Pro in the same way those created in ArcGIS Pro can. However, layer files created in ArcGIS Pro cannot be...