Intersectionality refers to the interrelation of grounds of discrimination.
One aspect of intersectionality is that two grounds of discrimination combined can lead to increased discrimination, for example if migrant women have bad chances on the labour market because they are women and migrants.
On the other hand, different factors of discrimination can interrelate and influence each other in a way that they can no longer be regarded separately. This could be the case if a young, Black man is stopped by the police and searched for drugs without concrete suspicion, which might not happen to an older person or a White young man. Because this person is young and non-White, he fulfils the cliché of a young, male, foreign dealer.