If someone could explain the difference, I would appreciate it very much.
Thank you.
If you posted some specific examples of equipment it might be easier to say whether they are the same or not. But, my short answer is that I, personally, would not rely on the
name of anything [digital] these days to decide what it actually is, and if if it does what I need, but spend time reading the user manual to see if what I need to accomplish is capable, and designed for ease of use, or simply a tacked on feature that is 5 layers down in some menu, maybe with limited features.
Longer answer, it may depend on a specific company's naming of a product, e.g., Zoom (Corp.) sells
multi-track recorders, which are "all-in-one" devices to record, mix with some FX and output, including overdub capability. They have [digital] "handy" recorders and field recorders, which are primarily or exclusively "multi-track-recorders" and don't include features most folks would want in an all-in-one device, i.e., something that would replace an interface+DAW. However, one or two of them may have a feature that means it works for one person's needs, but another model of the same type may not. (Tascam uses slightly different terminology, and their devices have a similar span, some of which may satisfy different specific uses better than others.)