The phonation is voiceless. This means that this sound is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
The place of articulation (where the sound is produced) is dental. This means that this sound is produced with the tongue at the upper teeth, the lower teeth, or both the upper teeth and the lower teeth. (Many stops and liquids that are called dental consonants are actually denti-alveolar consonants.)
The manner of articulation (how the sound is produced) is fricative. This means that this sound is produced by constricting air flow through a narrow channel at the place of articulation, to make turbulence.
Dalbor, John B. (1980), "Observations on Present-Day Seseo and Ceceo in Southern Spain", Hispania, American Association of Teachers of Spanish and Portuguese, 63 (1): 5–19, doi:10.2307/340806, JSTOR340806
Einhorn, E. (1974), Old French: A Concise Handbook, Cambridge University Press, ISBN0-521-09838-6