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TS/TRS vs TRRS Analog Audio AdaptersCurrenty, there's two dominant approaches to the kind of 1/8th inch / 3.5mm plugs that Apple-friendly USB audio dongles accept. For many years, particularly in the Windows PC world, computers featured SEPARATE microphone and speaker / headset connections. In general the microphone is mono and the headphone/speaker jack stereo. As such you'll find many Apple compatible USB audio adapter dongles that support two-jack style devices.
Two-Jack TS / TRS USB Sound AdaptersThose with separate jacks are ideal for older 2-plug mic headsets or mono microphones. The mic is a 2-conductor 1./8th inch (mono) plug and the headphone a 1/8th inch 3 conductor (stereo) plug.
One-Jack 4-Pole TRRS USB Sound AdaptersMore recently, since around 2010 and the rise of the smartphone and iPhone - audio in and out have been consolidated into a SINGLE 4-Conductor 'TRRS' type of plug that can handle both a monophonic microphone input and stereo audio playback to earbuds or headphones. These USB soundcard DACs have a single input jack on them to handle both mono audio in and stereo audio out. Those with a single jack are more appropriate for more modern 4-pole headphone with mic type of use.
Note that the above featured products are USB audio DACs that attach via a short USB cable. These may be a far better choice - especially on Apple MacBook Pro or Air laptops where a more common dongle 'block' would literally block the adjacent USB ports nearby.