although halloween and day of the dead are two totally different things, what is one thing they have in common?

Both Halloween and Day of the Dead involve special times set aside to acknowledge death and the presence of spirits, using symbols like skulls, skeletons, and themed decorations.

Shared core idea

Both celebrations center on the belief that the boundary between the living and the dead is thinner around late October and early November, so the dead or spirits can draw closer to the living.

One clear thing in common

If you have to name just one thing they share, it’s this:
Both are annual celebrations that focus on death and the spirit world, using costumes, skulls, and other imagery to represent that connection between the living and the dead.

Information gathered from public forums or data available on the internet and portrayed here.