What is mesh and nodal analysis?

Description : Find current through resistor using nodal analysis

Description : Nodal analysis problem two current source

Description : Nodal analysis problem

Description : I found that by the same process of applying KCL and KVL, the problems of mesh analysis can also be solved. My teacher used KCL and KVL too. So, what's the difference between mesh analysis and Kirchoff's laws?

Description : Mesh Analysis with two supermesh