Impetigo is a highly contagious bacterial skin infection primarily caused by Staphylococcus aureus or Streptococcus pyogenes. It typically spreads through direct contact with an infected person's sores or by touching contaminated surfaces, such as towels or clothing. Impetigo often occurs in children but can affect individuals of any age, especially when there are cuts or breaks in the skin. Good hygiene practices, such as washing hands regularly and avoiding close contact with infected individuals, can help prevent its spread.