Are DACs same as AMPs ?   --- I know that a DAC is not a AMP, and both have different functionality.   But is there really anything like a Headphone DAC. ??

I am planning to buy a DAC.    After exploring various forums, guides, youtube videos, its just overwhelming and confusing.   I have 2 headphones currently :    Audio Technica ATH-R70x Sony MDR-1R   -- Can someone please advice atleast 3 headphone amps, in order of preference.    I...