Tax lien investing involves purchasing liens on properties with delinquent property taxes, offering investors a potential avenue for passive income. These liens typically come with the right to collect the unpaid taxes plus interest. While investing in tax leins can yield high returns, it also carries risks, including property redemption by the owner or foreclosure proceedings. It’s crucial for investors to conduct thorough due diligence and seek professional guidance to navigate the complexities of tax lien investing effectively.