There are 3 types of capacity expansion - 1. Greenfield 2. Brownfield 3. Debottlenecking
Lets start with a example to understand all the above.If you buy a plot and construct a 2 floor house from scratch then this construction from scratch is called Greenfield capacity expansion
Now you have build 2 floor but want to build another 1 floor when your existing infrastructure is ready , then this another floor is called Brownfield capacity expansion.
Now on that 3rd floor if you want to build a separate room is space is left . This is called Debottlenecking capacity expansion.
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