DIFFERENCE BETWEEN PERCENTAGE AND PERCENTILE

Yesterday a man from entrance exam coaching centre came to advertise his centre.He told some valuable info about the mba colleges in India.He also explained the difference between percentage and percentile which i dont know till that time.Percentage we all know and percentile denotes the percentage of people scored below us.As CAT(Common Admission Test) has negative marks even if we score zero marks we will get ten percentile because ten percent people score negative marks.