What type of black spider features a white crescent marking on its back?

The black spider with a distinctive white crescent marking on its back is most likely the bold jumping spider (Phidippus audax). This spider is a common species in North America and is known for its striking appearance and energetic behavior. Its body is primarily black, with a fuzzy texture and iridescent green or blue chelicerae (mouthparts). The bold jumping spider is small but agile, using its excellent vision to leap onto prey or navigate its environment. Despite their intimidating look, these spiders are harmless to humans and play a vital role in controlling insect populations.