Lockdown may not be the ultimate solution for covid-19 outbreak. But however, it is one of the many ways in which the situation can be brought under control, an attempt can be made.

The
covid-19 disease is contagious. Th same disease comes up with different mutations
every few months, lately. Currently, the research says that, the latest
mutation of this disease in the 2^nd phase is spread in the air. In
other words, the disease in now in the air. The best way to avoid this to delay
direct exposure to air. Lockdown in a way helps, as it helps avoiding direct
contact with beings and also deducts direct exposure with fresh air, which is
no longer fresh. Not entirely, but the lockdown does helps in way to reduce the
commotion.

I hope this answer helps!😊