What is tonguing?

Tonguing

Tonguing is a technique used with wind instruments to enunciate different notes using the tongue on the reed or woodwind mouthpiece or brass mouthpiece. A silent "tee" is made when the tongue strikes the reed or roof of the mouth causing a slight breach in the air flow through the instrument. If a more soft tone is desired, the syllable "da" (as in double) is preferred. The technique also works for whistling. Tonguing (or articulation) refers to how a musician begins the note (punchy, legato, or a breath attack) and how the note is released (air release, tongued release, etc.) For wind players, articulation is commonly talked about in terms of tonguing because the tongue is used to stop and allow air to flow in the mouth. Tonguing does not apply to non wind instruments, but articulation does apply to all instruments.

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Some articles on tonguing:

Flutter-tonguing
... Flutter-tonguing is a wind instrument tonguing technique in which performers flutter their tongue to make a characteristic "FrrrrFrrrrr" sound ... to the growls used by jazz musicians Trombone flutter-tonguing Sorry, your browser either has JavaScript disabled or does not have any supported player ... A flutter-tonguing trombone ...
List Of Horn Techniques - Double/triple Tonguing
... Normal tonguing consists of interrupting the air stream by tapping the back of the front teeth with the tongue as said in the syllables 'da', 'ta', 'doo', or 'too' ... Double tonguing consists of alternating between the 'ta' and the 'ka' sounds or between the 'da' and 'ga' sounds ...
Sequenza X
... X requires the trumpeter to employ a variety of extended techniques, including flutter tonguing, pedal tones, and valve tremolos ... Techniques such as double tonguing and doodle tonguing are interchanged rapidly and often paired with valve tremolos and hand stops ... for brass, Berio's incorporation of doodle tonguing was inspired by jazz trumpeter Clark Terry ...
Articulation (music) - Procedure - Brass and Woodwind Instruments
... Woodwind and brass instruments generally produce articulations by tonguing, the use of the tongue to break the airflow into the instrument ... Furthermore, the implementation of double-tonguing may be required when many articulations are required in rapid succession ... Double-tonguing can be simulated by repeating the syllables "dig" and "guh" in rapid succession ...