what is the difference between internal hacker and external hacker(outside hacker)?

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Well one sits in his PJ's with a cup of coffee in his living room (Inside Hacker)
The other sits in the park with a laptop (Outside hacker).

Ok ok - only Joking!

Internal hacker means inside the company. Hacking from their office computer into the company's system.

External hacker means hacking from outside the company - breaking in from another country for example.

Internal hackers hack a network from inside (employee, gaining internal network access, etc)
External are not inside the company