Original: The territories of Jersey and Guernsey (collectively known as the Channel Islands), and the Isle of Man, though also under the sovereignty of the British Crown, have a different constitutional relationship with the United Kingdom, and are classed as Crown Dependencies.
Simplified: The territories of Jersey, Guernsey and the Isle of Man, though also under the sovereignty of the British Crown, have a slightly different constitutional relationship with the United Kingdom, and are consequently classed as Crown dependencies rather than Overseas Territories.