The word "Discrimination" refers to situations in which a person is disadvantaged or harassed because of certain characteristics or (actual or ascribed) belonging to a certain group. Many people face discriminations around the world, for instance, because of their origins, language, sexual identity, gender, religion, body type, mental abilities, age, etc. Discrimination is often based on invented concepts and faulty reasoning patterns. This is, for instance, the case when someone is discriminated against because of their "race". As modern science has proven, there are, in fact, no such things as different races in humans- but there are people who believe in a hierarchy of different races and value people based on it- and therefore discriminate against people they perceive as belonging to "other races".
Some may face discrimination on more than one grounds, for instance, a person who is a lesbian and has a "foreign name" is likely to face increased discrimination because of both her (presumed) foreign origins and sexual orientation.