Purification means: Cleanliness and being free from dirt, While in the context of Islamic Jurisprudence (Shari’ah): It means the removal of impurities and dirt.
First: Inner Purification
Second: Physical Purification:
a- Purification from Hadath (the state of ritual impurity).
Hadath is that which is produced from or befalls a body that prevents a Muslim from acts of worship for which purification is a requisite, e.g. As-Salah (prayer), circumambulation of the Ka’abah etc.; There are two types of Hadath:
Minor Hadath.. It is what makes ablution imperative like: urine, defecation, passing wind and all other nullifiers of al-wudu’ (ablution); Purification from these is achieved by performing al-wudu’.
Major Hadath .. It is what makes ghusl (a purificatory bath) imperative, e.g. sexual relations, menstruation etc. Purification from this state is achieved by ghusl.
If it is impossible to purify oneself through wudu or ghusl, then one purifies himself through Tayammum (a dry form of purification using soil).
Removal of any physical impurity is obligatory,
Purification from physical impurities entails:
1-purification of the place of prayer.
2-purification of clothes.
3-purification of the body.