Describe the reasons for collectivization.

Collectivization became a necessary measure, taking into account the political and ideological direction of the country.
The land could not belong to a certain person, since some worked harder, others less, and it turned out that the peasants were stratified. Some got richer, others poorer. Such a course of events would repeat the NEP.
On the other hand, the USSR was economically closed from other states, and the growing number of townspeople had to be fed with what is grown domestically.