Short answer: Maritime transport of goods in the Arabian sea.
The dhow indeed is still quite commonly used in and around the Arabian sea, down the east coast of Africa and India.
It is a overarching term for the general ship type of the Arabian sea with many subtypes that share the same characteristics.
Dhows sport one or more masts with lateen or settee sails and are commonly held to be the origin of these sailtypes that fit the conditions of the Arabian sea well.
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