Either shows options that are acceptable. Ex: Either the daisies or the roses will be fine. This means that if someone were to choose the daisies or the roses, that choice would be acceptable. The phrase follows this "formula": "Either... or..." Neither's meaning is the exact opposite. It shows options that are not acceptable. Ex: Neither the jacket nor the skirt matched the blouse she needed wanted to wear for the party. This means that both the jacket and the skirt were not suitable to go with the blouse. The phrase follows this "formula": "Neither... nor..."

Either A or B Neither A nor B = NOT A and NOT B

the means is different ,either is means "too” ，and neither is often conbine with nor......

neither = not either There is really nothing to explain