This document provides information about various Islamic concepts related to ritual purity (tahara) for prayers. It explains that tahara means ritual cleanliness according to Islamic law, while tahir means something that is ritually clean. Najasah means uncleanliness, and najis means unclean. It distinguishes between things that are najis al-ayn, meaning originally and always unclean, like blood, dogs, pigs, wine, dead bodies, etc. versus things that become najis through contact with something najis, called mutanajis. It notes that intention is required for acts like ghusl and wudu but not when purifying something najis. The