Sherlock Holmes is a fictional detective created by Sir Arthur Conan Doyle, known for his extraordinary powers of observation, deduction, and logical reasoning. Holmes is a tall, thin man with piercing eyes, often seen wearing a deerstalker hat and smoking a pipe. He lives at 221B Baker Street in London and is assisted in his investigations by his loyal friend Dr. John H. Watson. Holmes is both arrogant and enigmatic, sometimes coming across as aloof and detached from others. Despite this, he displays a strong sense of justice and commitment to solving crimes. He frequently has run-ins with the criminal underworld, particularly the arch-nemesis Professor Moriarty. His immense knowledge of various subjects aids in piecing together clues to solve complex cases.