Boneless chicken typically does not have a skin, as this is removed during the process of removing the bones. For this reason, it is sometimes considered healthier. A downside is that the skin may help prevent the chicken from drying during cooking, so that it can have more moisture and flavor.
An upside of boneless and skinless chicken breast is that it is versatile and easy to handle.
Boneless chicken wings are not actually wings, but rather are typically formed from breast meat, which is faster to cook but not as succulent as real wings, which have skin, bone, and cartilage. Part of producers' incentive to make boneless chicken wings is that wholesale chicken breast can be cheaper.