Impeachment is best described as like being charged with a crime. The House has made allegations of high crimes and misdemeanors and Impeached the Office Holder for those crimes. However, at trial (The Senate tries Impeachment) the charges can be found not guilty, which means that legally speaking, the House did not provide sufficient evidence to make the charge stand.
Anyone who has Articles of Impeachment by the House brought against them is considered to have been Impeached, but only upon conviction by the Senate does the officer get removed from office. If found Not Guilty, it's merely a footnote that it happened and the Officer does not lose any Legal Authority for the duration of the term.
To give an example in a purely criminal stance, OJ Simpson was famously charged with murder but was not convicted (by a finding of Guilt by the Jury) of Murder. From a legal standpoint, regardless of your opinion of the outcome of the finding of "Not Guilty" of OJ Simpson, he is legally not guilty of killing his wife and another person. However, he was legally charged with his crime. Similarly, Bill Clinton was Impeached but was not convicted of any Impeachable offense brought against him. Donald Trump is not yet at, time of writing, even Impeached and is merely being investigated for a possible Article or Article(s) of Impeachment.
Or to put it even more plainly, we're still somewhere close to the first Doing Doing of an episode of "Law and Order". We're far off from the commercial break following the officers arresting the suspect and the back-half of the episode where the lawyers mess around in the court room.