Depreciable assets are business assets which can be depreciated. That is, the value of the asset is considered as a business expense over the life of the asset. The ability to expense an asset is useful for tax purposes.
Depreciable assets include equipment and other tangible assets. Supplies cannot be depreciated because they are considered to be used within a single year and they are expensed during that year. Accounts receivable are not depreciable assets.
Read more about Business Assets and Taxes