The term "String"

I have been reading up on solar and am seeing the term "string" in reference to solar panels.

I am a bit confused with this term. I see that when fusing solar panels if you have a single string (or in some cases 2 strings) no fusing is necessary. If you have 3 or more strings you need to fuse the panels. I understand that this is because of the amperage adding up (parallel wiring) and could back feed into the other panels in case of a short, burning out the other panels and equipment and starting fires.

Here is my question about the term string. If you have 3 or more panels wired in parallel is this considered 3 strings? Wired in parallel is each panel considered a string by itself? If you have 3 or more panels wired in series is this considered 1 string?

If I am correct I assume you would need a fuse for each panel that is wired in parallel if 3 or more panels are used.

If you have 3 or more panels wired in series I assume you would not need a fuse (amperage stays the same as one panel), but if you have 3 series strings (3 or more panels per string) wired in parallel (9 or more panels in total) then you would need fuses for each series string (3 fuses).

I hope I worded this in a way I didn't muddy of the waters.

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The term "String"