Think of it like the "like" or "heart" of your favorite social communities. The Talend community has the Kudo. Use it to let your peers know you agree with their post, that you're also having the same issue, that a reply answered your question (although also feel free to use the "Accepted Solution" button too!), and to vote up something.
And the more Kudos you and your posts get, the more you climb up the ranks of the community.