What are deferred tax liability & deferred tax assets?

respected members,

i am facing a dilemma here.

I have no know ledge about deferred tax liability & assets about its calculation & disclosure requirements in balance sheet as well as for any other report purpose. Please also explain about MAT Credit, & unabsorbed depreciation in income tax  & its relation with deffred tax calculations.

SO please help me in this matter with depth knowledge  & also explain me with examples.