Spanish phonology

This article is about the phonology and phonetics of the Spanish language. Unless otherwise noted, statements refer to Castilian Spanish, the standard dialect used in Spain on radio and television. For historical development of the sound system see History of Spanish. For details of geographical variation see Spanish dialects and varieties.

Spanish has many allophones, so it is important here to distinguish phonemes (written between slashes / /) and corresponding allophones (written between brackets [ ]).

The phonemes /b/, /d/, and /ɡ/ are realized as approximants (namely [β̞, ð̞, ɣ˕], hereafter represented without the undertack) or fricatives in all places except after a pause, after a nasal consonant, or—in the case of /d/—after a lateral consonant; in such contexts they are realized as voiced stops.

...
Wikipedia