Depreciation is a method of allocating the cost of a tangible asset over its useful life through a reduction in the asset's value each period. It represents a permanent fall in the value of fixed assets arising from use in business. The objectives of depreciation are to calculate proper profits, show the asset at a reasonable value, and maintain the original investment amount. Common depreciation methods include straight-line and reducing balance. Tangible assets have physical properties and existence while intangible assets represent claims to future income from tangible assets.