Why is a diffraction grating better than a two-slit setup for measuring wavelengths of light?

Diffraction is a process by which a beam of light spreads when passing through a narrow passage or across the edge of an obstacle accompanied by interference between the waveforms.

Diffraction gratings are used in the laboratory to form interference patterns. It has a large number of slits, which produces a very sharp maxima due to which angle of deviation can be measured precisely.

As we know, the sharpness of maxima depends on the number of slits used in the experiment. As the grating has a large number of parallel equidistant slits of the same width, so the fringes formed by the grating are very sharp. Also, the resolving power decrease with a reduction in the number of slits, which is why diffraction grating is better than two-slit diffraction for measuring of the wavelength of light.