Manufacturing involves a full array of production from handicrafts to moulding iron and steel and stamping out plastic toys to assembling delicate computer components or space vehicles. In each of these processes, the common characteristics are the application of power, mass production of identical products and specialised labour in factory settings for the production of standardised commodities. Manufacturing may be done with modern power and machinery, or it may still be very primitive.

Why is there focus on production of standardised commodities in manufacturing industries ?

Both of the above

There is focus on production of standardised commodities in manufacturing industries because there is mass production of identical products which should be of same standards.