The cavaquinho is a small Portuguese string instrument with four wires or gut strings, belonging to the European guitar family. It is also a four-stringed subdivision of the lute family. The instrument is widely used in various music genres. In Portugal, the most common tuning is C G A D, while in Brazil, it is tuned to D G B D. The cavaquinho has different forms and names across regions, such as machete, braguinha, and ukulele. It has been adapted and influenced other instruments like the Brazilian samba cavaco, Cape Verdean cavaquinho, Hawaiian ukulele, and Venezuelan cuatro. The origins of the cavaquinho are uncertain but may have been influenced by Greek and Biscayan cultures.