日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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I have a question about the suffix られている. What does it mean?

I understand it's the suffix られる (passive past or potential tense), with ている (is/was doing) applied. I have no clue what those would combine to mean. Can someone explain this to me? It's not covered in any of my textbooks, nor is google returning anything helpful. Strangely, it keeps showing up in a manga I'm trying to translate for learning purposes.