An American Depositary Receipt (or ADR) is a way for US investors to trade shares of non-US companies without having to use their local exchanges.
Because they are issued by US financial institutions and traded on US exchanges, ADRs eliminate many of the complications associated with purchasing shares abroad. Dividends and profits from share price fluctuations will be paid in US dollars.
ADRs are a good way for a non-US company to raise capital and gain more exposure to US equities investors.

You can fin more information here https://wikipedia.org/wiki/American_Depositary_Receipt

An American Depositary Receipt (ADR) is a financial instrument that allows U.S. investors to trade shares of foreign companies without dealing directly with overseas markets. Representing a specific number of shares in a foreign corporation, ADRs are issued by U.S. depositary banks and trade on American stock exchanges like regular stocks. They simplify investing in international companies by eliminating currency conversions and foreign market regulations. ADRs come in different levels (I, II, III), depending on regulatory compliance and trading venues. Investors benefit from diversification and access to global growth opportunities, while foreign firms gain exposure to U.S. capital markets. However, ADRs carry risks like currency fluctuations and geopolitical factors. Popular ADRs include companies like Nestlé, Toyota, and Alibaba, making them a convenient way to invest globally while staying within the U.S. financial system.