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Adding to this, there currently is and will be some future overlap in time where the old ExtendScript will still be workable, however, the writing is indeed on the wall and UXP is the new heir to the throne. At some future point in time, Photoshop will not support both methods and only UXP will work. When ExtendScript will no longer work has not yet been announced.

UXP is a work in progress and not as mature as ExtendScript, however, it does show promise as a modern language replacement that can interact with other modern systems. I am waiting for UXP to mature, so I will continue to script in legacy ExtendScript before I am forced to use UXP when it becomes unsupported.

UXP is often mentioned in the context of graphic user interface panels, however, it can also create simpler scripts which use the .psjs extension, rather than the legacy ExtendScript .jsx extension. It isn't possible to combine both legacy ExtendScript code and UXP code in the same script.