What makes the Spring framework a lightweight container?

Question

When people mention that Spring is a lightweight containter compared to other frameworks, do they mean? That it occupies less memory in the system or it does not have the op

Answer 1

I think one can also say that spring is light weight because it uses POJO(Plain old java object) .POJO class does not require to implement,extends technologies specific API(Interfaces,Classes) or it is not bounded to any technology specific API