With the help of glue.

Not at all.

Our blood consists of red blood cells, white blood cells, platelets, clotting factors, etc.

Suspended in a liquid plasma.

Hey.

I too have a plasma, look.

Please listen.

Usually, when a blood vessel gets ruptured and we bleed, our blood begins to form a clot.

First, the platelets start sticking to the broken vessel and each other.

Thus forming a loose plug.

But this plug is not enough to stop bleeding.

Hence,

The clotting factors take part in a complex chain of chemical reactions and create fibrin strands.

These strands criss-cross one another and create a mesh that tightly holds the loose plug together.

Makes it strong.

Red blood cells and white blood cells also get trapped in the mesh.

Thus creating a blood clot that completely stops bleeding.