I know that D$p$ branes are branes with $p$ spatial dimension with satisfying Dirichlet boundary condition. I want to confirm the following things.
First, I heard the D-branes are massive, and these massive D-branes is well described in $Ads$ geometry. Is it right? Why D-branes are massive?
In some context, D-branes are related with M branes. What is M-brane? Is it just some object describes in M-theory? I also heard M5 brane is related with D4 brane with some manipulation(dimensional reduction).
In the process of reading some papers, interestingly, M branes are also related with NS branes. What is NS-brane? Is it just some object describe in NS sector?
Is all branes are related with each other? What i mean is D brane and M branes seems have some similarity and M branes and NS brane have some relation. So there might be some relation about D-branes and NS branes.