This document provides an overview of accounting for depreciation as per AS-6. It defines depreciation as a permanent decrease in the value of a fixed asset due to use, age, or obsolescence. Depreciation is a non-cash expenditure used to allocate the cost of a fixed asset over its useful life. The document outlines the objectives and importance of providing depreciation, the causes and basic factors used to calculate depreciation, and common methods for calculating depreciation including fixed installation, diminishing balance, and annuity methods. It also defines depreciable assets and disclosure requirements regarding depreciation accounting policies under AS-6.