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# 1. what is finite automata?

**Answer:**

A finite automaton (FA) is a simple idealized machine used to recognize patterns within input taken from some character set (or alphabet) C. The job of an FA is to *accept* or *reject* an input depending on whether the pattern defined by the FA occurs in the input.

A finite automaton consists of:

- a finite set S of N states
- a special start state
- a set of final (or accepting) states
- a set of transitions T from one state to another, labeled with chars in C

**Asked In :: **
Wipro

A finite automaton (FA) is a simple idealized machine used to recognize patterns within input taken from some character set (or alphabet) C. The job of an FA is to *accept* or *reject* an input depending on whether the pattern defined by the FA occurs in the input.

A finite automaton consists of:

- a finite set S of N states
- a special start state
- a set of final (or accepting) states
- a set of transitions T from one state to another, labeled with chars in C