Auto MDI-X is a feature found in many modern network devices that automatically detects the proper connection type, regardless of the cable used. This means that a device with Auto MDI-X can use either a straight-through or crossover cable for any application. As a result, the need for crossover cables has diminished as network devices can now detect the proper connection type without the need for specific cable configurations. Straight-through and crossover cables can be used interchangeably in many cases, simplifying network setup and configuration.