Equity securities, also known as stocks or shares, give investors partial ownership in a corporation. Equity holders have rights to vote on matters such as corporate policy and wealth distribution, including dividends. The value of equity securities can fluctuate based on the performance of the company as well as market conditions. In the context of web3, equity security can also refer to tokenized equity, where ownership rights are represented by tokens on a blockchain, allowing for broader accessibility and liquidity in trading.