Tags are like keywords or labels that you can add to a photo to make it easier to find later. You can tag a photo with tags like "catherine yosemite hiking mountain trail" and then later on if you are looking for pictures of Catherine you can just click on that tag and get all photos that have been tagged that way.
You may also have the right to add tags to some of your friends' photos, because the ability to add tags is one of the things which you can allow access to in the privacy settings for your photos.
Flickrは、自分の写真を共有するためのサイトです。アップロードした画像が(i)写真でないとき、又は(ii)「借りてきた」画像、写真素材集の写真、有名人の写真、他人の著作権に係るもの、キャプチャー画像、ポルノ若しくは全裸／半裸写真であるときは、おそらく「NIPSA(Not in Public Site Areas：公開サイトエリア不適格)」指定されるものとお考えいただいたほうが安全です。そうでない場合には、アカウントは審査待ちに入っていますので、間もなく審査されるでしょう。
When you sign up for Flickr, your new account is marked as 'pending', until Flickr administrators have reviewed it to make sure you aren't posting offensive images, or junk downloaded from the web. When your account is 'pending' your photos won't show up in public photo lists, like Everyone's Photos, or pages that show all photos tagged with a certain tag (e.g.).
Flickr is a website for you to use to share your photos. If the images you're uploading either (i) aren't photos, or (ii) are images you've 'borrowed', stock photos, celebrity photos, stuff that appears to be copyrighted by someone else, screenshots, porn or nudity/partial nudity, it's safe to assume that we will probably have marked you as NIPSA (Not in Public Site Areas); otherwise, your account is in the review queue, and will be attended to shortly.
If you would like to contact us about your account status, feel free.