You may have noted that the Questions posted in this Community come in two varieties: those with the icon on a red background and those, where the background is green.
The latter indicates that the original author has validated a reply as the solution to the issue.
Obviously, this helps other users with similar questions to quickly find the most relevant posts.
So, if you have posted a question here, and are satisfied with an answer you have received, please take the time to validate it; guide others in the same situation to the correct response.
Thank you.

PS: Other than by using the colour, you can use the 6WTags to filter down your candidates. For Questions, the status tag has three possible values: "validated", "answered but not validated" and "not answered".