Meaning of "reference letter"

[Heiner]

Business English Courses, Elementary Level

ESL/EFL Test #81 "Renting a place", question 8

It is always good to provide ......... letter to the landlord to prove that you are a good character.

(a) an accredited
(b) a touching
(c) an anonymous
(d) a reference

Business English Courses, Elementary Level

ESL/EFL Test #81 "Renting a place", answer 8

It is always good to provide a reference letter to the landlord to prove that you are a good character.

Correct answer: (d) a reference
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plz explain me the meaning of each word

[Mister Micawber]

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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber