A stereotype is a "fixed image" of an individual or a group - Like (all black people are ghetto, or all asians are math whizes, OR all middle easterns are terrorists).
Discrimination is directly related to prejudice - where someone is treated unfairly because of their race, religion,age, gender, or ethnicity.
(white man gets a job over a more qualified african american woman <--this is two in one. (race and gender)).
Discrimination can relate to many different things - Discrimination is an "umbrella term" other things like (injustice, ignorance, homophobia, prejudice, stereotyping, and bias)...fall under this umbrella.