Legal aid is vital assistance for those unable to afford legal representation, ensuring access to justice as outlined in the Legal Services Authorities Act of 1987. It promotes equality before the law, the right to counsel, and the right to a fair trial for marginalized groups such as women, children, and individuals from scheduled castes and tribes. The act establishes eligibility criteria for legal services and emphasizes that legal aid is a state obligation, not a charity, aiming for equal justice for all citizens.