This one over here is telling you that the sellers are in control because it has pushed price lower from the highs all the way to the closing where it last opened.
A Gravestone Doji looks something like this:
A Dragonfly Doji is something like this:
It's the opposite of the gravestone where you have a very strong price rejection of lower prices!
And the price closes back where it opened.
With that said, let's have a look at some Doji on this chart:
You can see that the price has actually opened and closed at the same level but you can see that it rejected lower prices.
I'm not really a fan of going straight that will lead to the technical definition.
I think what's more important is the context of the candlestick pattern.
There's really no need to memorize the exact pattern if you can understand what the market is trying to tell you.
Okay, so let's do a quick recap...