El arpa es un instrumento musical armónico de cuerdas pulsadas compuesto por un marco resonante y una serie variable de cuerdas tensadas entre la sección inferior y la superior. Las cuerdas pueden ser pulsadas con los dedos, con una púa o plectro. Además del arpa clásica, usada actualmente en las orquestas, existen otros tipos, como el arpa celta, el arpa andina, el arpa llanera y el arpa paraguaya. El arpa es un instrumento de cuerda pulsada característico de las músicas tradicionales de países como Irlanda, Paraguay, Perú, Venezuela, México y Chile, entre otros.

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The harp is a stringed musical instrument which has a number of individual strings running at an angle to its soundboard, which are plucked with the fingers. Harps have been known since antiquity in Asia, Africa, and Europe, dating back at least as early as 3500 BC. The instrument had great popularity in Europe during the Middle Ages and Renaissance, where it evolved into a wide variety of variants with new technologies, and was disseminated to Europe's colonies, finding particular popularity in Latin America. While some ancient members of the harp family died out in the Near East and South Asia, descendants of early harps are still played in Burma and in Sub-Saharan Africa, while other defunct variants in Europe and Asia have been revived by musicians in the modern era. Harps vary globally in many ways. In terms of size, many smaller harps can be played on the lap, while larger harps are quite heavy and rest on the floor. Different harps may use strings of catgut or nylon, or of metal, or some combination. While all harps have a neck, resonator, and strings, "frame harps" have a pillar at their long end to support the strings, while "open harps", such as arch or bow harps, do not. Modern harps also vary in techniques used to extend the range and chromaticity of the strings, such as adjusting a string's note mid-performance with levers or pedals which modify the pitch.

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