As you have heard from the others in hold'em you make the best 5 card hand out of you two card on the hand and the five on the table.
Maybe it is the five on the table maiking the best hand at all and then pot splits between players at show down.
Thats why it is a very good hand if you hold the two card on your hand that makes the two highest card at the straight. it is called straight with two overcards.
If you want to learn a lot about this you can join pokerstars
on the web they have a web based pokerschool, It has no connection to their pokerclient.
exept from the fact that you can join some freerolls
and play in their Open Skill League.
You go trough different lessons and you will get rewarded with tournaments tickets and so on while studying.
If you join pokerschool before making your first deposit they used to give you 500 FPP or VPP but I dodnt know if they do that anymore.
Hope you could use this