Wtf does this syntax mean (CVI/opencv python)?

cv.warpPerspective(src, M, dsize[, dst[, flags[, borderMode[, borderValue]]]] ) ->dst

Does anyone know what are these random [ in between the parameter names?

Source: https://docs.opencv.org/4.x/da/d54/group__imgproc__transform.html#gaf73673a7e8e18ec6963e3774e6a94b87
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