Please give me a broad description of the below topics: ( computer theory) 1. , what happens when you concatenate two D

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Please give me a broad description of the below topics: (computer theory)
1. , what happens when you concatenate two DFAsmachines?
2. The second question is on NFAs, what happens given aninput, what the transition function is, and to convert themachine to a regular expression
3. limits of finite automata and draw a diagramillustrating a machinegiven unions, complements and concatenations.
4. Please give a low-level description of a Turingmachine, with a state diagram