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Aggregation Layer, in Decentralized Finance (DeFi), consists of aggregators who connect various applications from the previous layer to provide a service to investors. For example, they might enable the seamless transfer of money between different financial instruments to maximize returns. In a physical setup, such trading actions would entail considerable paperwork and coordination. But a technology-based framework should smoothen the investing rails, allowing traders to switch between different services quickly. Lending and borrowing is an example of a service that exists on the aggregation layer. Banking services and crypto wallets are other examples.¹⁾

Source: https://www.investopedia.com/decentralized-finance-defi-5113835