Nfa
In short
A Non-deterministic Finite Automaton (NFA) is a theoretical machine used in computer science to recognise patterns in strings of symbols. It allows for multiple possible paths or transitions for a single input symbol.
In plain words
Imagine a machine that can be in several states at once. When it reads a symbol, it might follow many different paths simultaneously. If any one of those paths leads to a successful finish, the machine accepts the input.
A simple example
If you are searching for the word 'CAT', an NFA might start looking for 'C' at every single letter in a sentence at the same time. It does not have to wait for a specific starting point to begin its search.
Why it matters
NFAs are essential for designing regular expressions and compilers. They help computers quickly search through text and understand the structure of programming languages.
Easy to mix up
Do not confuse an NFA with a DFA (Deterministic Finite Automaton), which can only follow exactly one path for every input.