What are the key differences between short run and long run costs in economics?

In economics, the key difference between short run and long run costs is that in the short run, some costs are fixed and cannot be changed, while in the long run, all costs are variable and can be adjusted. This means that in the short run, a business may have to deal with fixed costs like rent or equipment, while in the long run, they have more flexibility to adjust their costs to maximize profits.