Systemic (or institutionalized) racism, isn't usually something overt and many times isn't even intentional.
In an attempt to keep this short, basically its the ways, practices, views, etc. of the dominant and most powerful group being forced upon those group with less power and influence. As well as making the subgroup's ways, practices, views, etc seen as inappropriate. It can also seen in government making policies and laws to the detriment of a particular subgroup.
That's an oversimplification, and if you want a better, more organized explaination I would recommend googling it.
An example question.
Two guys walk in to interview for a high level job. They both have the same experience and knowledge of the field. They even have on the same clothes. Which one of these guys is more likely to get hired?