The charging line specification is the size of the charging line cross section, and the charging current is large if the cross section is large, and the opposite is small.
Note Each charger has a model. Generally, we will think that 5V1A is no problem with slow charging, and 5V2A is fast charging. Don't look at the difference between the two sides only the current 1A, the difference is actually quite large, let's make an example:
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1.5V1A and 5V2A are like a ruler of the same size, but the pipes filled with water are different, the former will have a smaller tube and the latter will have a larger tube.
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The difference between 2.5V1A and 5V2A is that if we also charge the phone, the latter will naturally be faster. The former will be slower.