Depreciation is the gradual reduction in a vehicle’s value over time. It is one of the most important financial factors in car ownership, yet many buyers and sellers do not fully consider it. A new car begins to lose value immediately after purchase. The highest drop often happens in the first few years, especially when the vehicle is no longer considered “new” in the market. Depreciation depends on several factors. Brand reputation, mileage, condition, accident history, and market demand all influence how fast a car loses value. Some vehicles retain value better than others. Reliable brands and fuel-efficient models often depreciate more slowly because they remain in demand in the used car market. Poor maintenance and high mileage usually accelerate depreciation. Buyers prefer vehicles with clean service history and lower wear levels, which affects resale pricing. There is also the issue of modification. Non-standard changes can reduce resale value because they may limit buyer interest or raise concerns about reliability. Many owners only think about the purchase price and ignore future value loss, which leads to unrealistic expectations when reselling the vehicle later. Depreciation should be seen as part of the total cost of ownership, not just a future problem. It affects long-term financial planning and replacement decisions.