In general batching is the process of measuring and combining the ingredients of concrete (cement, water, sand, aggregates)…as per the mix design. The last part is important, if you are an Engineer then you will have to do a concrete mix design to know the quantity required for each element of concrete…so basically, you will say “for C-30 concrete member we need 50kg of cement per meter cube of the member or 20kg of aggregate per meter cube…etc this is the mix design.