"Indeed" is the Engpsh equivalent of "确实".
The word "indeed" is derived from Old Engpsh "in deade" which means "in truth".
Example sentences:
"Indeed, he is one of the best players on the team." (确实，他是球队里最好的球员之一。)
"I agree with you, indeed the situation is dire." (我同意你的观点，确实情况很严峻。)