Diminishing Musharakah is a type of partnership where one partner gradually purchases the shares of the other partner over time. There are two types: Shirkat-ul-Aqd (joint venture) where partners start a business together, and Shirkat-ul-Milk (joint ownership) where partners jointly purchase an asset. Diminishing Musharakah is commonly used in Islamic banking for house financing through purchase, construction, renovation, or balance transfers, where the bank and client enter a partnership agreement and the client gradually purchases the bank's share of ownership.