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Stridulation is a high-pitched chirping, hissing, or squeaking sound, such as the one which male crickets and grasshoppers make by rubbing body parts together.

stridulation

Insects can make buzzing sounds by fluttering their wings, or sounds called Stridulation, made by rubbing body parts together (for example, grasshoppers rub their legs against their wings).

Often we can't hear the sounds many insects make, unless they are recorded and amplified.

Yes, grasshoppers produce sounds to attract mates and protect their territory. Unlike crickets, grasshoppers do not make sound by rubbing their wings together. They make sound using stridulation or crepitation. Stridulation is rubbing one body part against another, crepitation is when the grasshoppers snap their hindwings rapidly as they fly.