Compare NFA and PDA.

NFA
1. The language accepted by NFA is the regular language.
2. NFA has no memory.
3. It can store only limited amount of information
4. A language/string is accepted only by reaching the final state.

PDA
1.The language accepted by PDA is Context free language.
2. PDA is essentially an NFA with a stack(memory).
3 It stores unbounded limit of information.
4. It accepts a language either by empty