Let's clear up something right now. Neophytes, luddites, noobies, whatever you want to call yourself (or what some forum members have called you), you need to be sure of what it is you're using or asking about. There are mixers, there are MIDI controllers. There are vinyl turntables, there are CD turntables, and there are MIDI controllers that have platters that simulate the use of turntables. Let's put down some examples. Because it's getting confusing and people are buying the wrong things, only to be sadly disappointed or told they've got the wrong product.
This is a Rane TTM56. Widely acclaimed as the world standard for scratch mixers, for DMC-style turnablist competition:
This is an Allen & Heath Xone 62, and is an example of an installation-style club mixer:
Neither of these controls Traktor on its own.
This is a Vestax VCM-100. It's a MIDI controller that has its own soundcard, and can control Traktor's internal mixer functions. But it is by no means a "mixer", as it can't fade/mix between two external sources. It must be hooked up to a computer, and controls only internal mixer functions.
Some mixers have their own MIDI functionality and can quite happily control Traktor functions while still mixing between two analog or digital sound sources. Example? My beloved Korg Zero4, which, properly programmed, can actually control Traktor without the need for turntables or CD player or even another MIDI controller. Remember, a "mixer" does not REQUIRE hookup to a computer to work, whereas a MIDI controller is useless if not hooked up to a laptop/desktop.
Turntables/CD Decks/MIDI controllers with platter:
Here is the Technics 1200MK5 turntable, the current reigning king of vinyl turntables:
Seeking to dethrone the king are the Vestax PDX series of turntable (PDX-3000 shown):
The Stanton STR8-150:
And the Numark TTX (TTX USB shown):
Here, likewise, are some examples of CD turntables. Some do have the added benefit of outputting MIDI or HID signal to control Traktor/Serato, but their primary function is to play CDs, of the type burned by the download-inclined or purchased by those who still frequent music stores. Some even play MP3 CDs, but depending on features, usually don't hook up to computers to play sound files on the hard drive.
A shining example of a CD deck that has both of these functions is the Pioneer flagship CDJ-2000. It's got a scratchable (non-motorized) platter and plays regular CDs just fine, but can output in HID mode to control Traktor transport functions:
There are also Denons. See the DNS-3500. Similar to the Pioneer in style, but a few marked differences you can read up on, such as a rotating, motorized platter to simulate vinyl playback and feel:
Some of the mobile or small-installation crowd may encounter CD players like those below, which combine a rackmounted pair of CD trays with a separate rackmounted player section, which usually doesn't have platters but uses tiny jogwheels instead. See the Denon DC-D4500.
And here is an example of a MIDI controller that uses jog wheels with which to scratch, cue, or simply tempo bend. The ubiquitous Vestax VCI-100:
Note that like the VCM-100 it does have faders and knobs laid out in typical mixer fashion, but the VCI-100 cannot mix between two sound sources without a computer connection, and it simply sends MIDI signals to and from the computer in order to control the software's internal manipulation and mixing of the sound files loaded and playing therein. Thus it cannot be defined as a "mixer" or a "turntable" or "decks".
The newer Vestax VCI-300 includes its own sound interface and uses HID instead of MIDI to control Serato's Itch software (can be used for the most part in Traktor as well btw), but it is still not considered a mixer OR a turntable:
Some controllers, like the fantabulous Numark V7, attempt to bridge the gap between turntable and MIDI controller, by adding motorized platters to controllers but they are STILL controllers in that they require a computer hookup to manipulate sound:
There is also the world famous NS7, which basically is a giant VCI-300 but with motorized platters, hernia-inducing weight, and generally awesome functionality, or perhaps a better comparison would be that it's like having two V7s sandwiching a mixer (a TRUE 2-channel mixer that has some HID functionality itself). Again, this setup does not work on its own and needs a computer and the appropriate software (Serato Itch is bundled) to manipulate and mix music.
If you take nothing else away from this early-morning jabberwocky, remember: mixers and turntables don't need a computer to play or mix between tracks. MIDI and HID controllers DO need to be hooked up to a computer to play tracks stored on said computer. And now back to our regularly scheduled programming.