There are many things which allows the people to begin specializing such reduction in risk, solidarity, money saving, accurate time management and etc.
The specialization can be explained as the process where an enterprise or manufacturing unit concentrates on the production of goods and services which have low scope to gain the greater degree of proficiency.
Also, this process of specializing opens the path of world trade and some of the countries have enough production capacity to sustain themselves and trade off to the globe.