Its simply creating a wrapper to call multiple methods .
You have an A class with method x() and y() and B class with method k() and z().
You want to call x, y, z at once , to do that using Facade pattern you just create a Facade class and create a method lets say xyz().
Instead of calling each method (x,y and z) individually you just call the wrapper method (xyz()) of the facade class which calls those methods .
Similar pattern is repository but it s mainly for the data access layer.