The Dell Latitude D400 is a lightweight and compact laptop from the early 2000s, designed for professionals seeking a balance of portability and performance. Featuring an Intel Pentium M processor and a 12.1-inch display, it offers solid computing power for everyday business tasks. With its slim design and long battery life, the Latitude D400 is ideal for mobile users who need reliable performance without compromising on portability. The D400 was part of Dell's Latitude series, known for its durability and business-oriented features.