Greek yogurt is simply regular yogurt that has been strained. As the liquid is strained out, the yogurt ends up with more protein per given volume since most of the protein stays with the yogurt part instead of staining out with the liquid. If you have organic yogurt but want the Greek kind instead, you can simply strain it for a while. A coffee filter lined strainer or colander works just fine. Or lined with cheese cloth works well too. The longer it is strained the firmer it becomes. When strained long enough, especially if a weight is placed on top, after a while it becomes something called yogurt cheese. It ends up with a cream cheese consistency and can be used just like cream cheese. Both kinds, organic and Greek yogurt, are healthy. Just make sure that any kind yogurt has active yogurt cultures listed. If it does not, it’s not really yogurt anymore and you wont get the yogurt culture benefits.