why some question are highlighted? [duplicate]

Question

Possible Duplicate:
Windows-7 -tagged questions are highlighted light blue

As in the picture shown, why some question are highlighted ?

Answer 1

Because most likely you have some favorite tags which might include windows-7

Then all questions about windows-7 get highlighted on the site for you, because you're likely more interested in these

See this MSO question for more information: What do “favorite tags” and “ignored tags” do?

For future reference, go have a look around the FAQ on MSO it will most likely answer a lot of your questions