Integrated
The most popular category of amplifiers, which are most often divided into class A, A/B, D, each offering a different character. When purchasing an integrated amplifier, it is good to check whether you need an integrated D/A converter, which expands connectivity with digital inputs (coax, optical, USB B). If, on the other hand, you own high-quality audio-video components that already have their own DAC, fully analog connectivity will suffice, and you will use analog cabling between the devices RCA/XLR.