Explain the difference between an indirect democracy and a direct democracy. ​

In Direct Democracy the people used to take the socio-political initiatives directly, without feeling the need to pursue their legitimate and legislative demands through the intermediation of representatives. Mostly, it was a possible and popular way of practicing democracy in underpopulated areas but with the rapid growth of population, ‘Indirect or Representative Democracy’ replaced the former.

Hope this answer is right!

the only true answer is that it expanded after 325 ad.

the roman empire began to fall