CDs in unopened containers (Pascoag, RI)

I have 80 CDs in unopened packages.

First container is DYNEX DVD+R, for recording data & video,
50 pack, 8X, 120 min, 4.7 GB
Second container is FUJIFILM DVD+RW, 15 discs, 120 min, 4.7 GB
Third container is FUJIFILM DVD-RW, 15 discs, 120 min, 4.7 GB

I don't know what the + and/or - sign means on the FUJIFILM discs

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