If you have a known European genealogy and partial genetic ancestry from Africa, it indicates that some of your ancestry traces to Africa or perhaps North Africa. It is important to note that North Africa is considered part of the Middle Eastern Continental group, but there is a gradient of genetic similarity between African and North African populations. Your genetic ancestry may be from ancestors who were taken to Europe and the Americas as indentured servants and slaves.
At times, the source may first trace back to those who intermarried with Native Americans.
When considering what genetic ancestry from Africa means to you and your research, you should consult the full list of reference populations for the African Continental group and each of its Subcontinental groups.