It is a mixture of lime (fat lime or hydraulic lime), sand and water. Fat lime, which acts as a binding material, is added for preparing mortar when it is to be used in masonry work and hydraulic lime is added when mortar is to be used in foundation work or in damp conditions. Generally, lime to sand ratio is kept 1:2.

Types of Mortars:

Cement Mortar
Gauged Mortar (or Combination Mortar)
Surkhi Mortar