There are black dots here and there on the wall.
adverb, adverb taking the 'to' particle
bit by bit; little by little; gradually
Describes something happening slowly and in small increments.
仕事がポツポツと片付いてきた。
The work is getting done bit by bit.
adverb, adverb taking the 'to' particle
here and there; scattered; dotted
Indicates that things are sparsely distributed or appear intermittently.
公園にはポツポツと人がいる。
There are people scattered here and there in the park.
adverb, adverb taking the 'to' particle
Used for rain or other liquid falling in sparse drops.
雨がポツポツと降り始めた。
It started to rain lightly, drop by drop.
I looked up at the sky, and rain started falling in scattered drops.
He began to talk about the old days little by little.
There are houses dotted here and there around that area.
Little spots appeared on my face.
ぽつぽつ describes drops or occurrences appearing one by one with slightly larger gaps, while ぱらぱら suggests a lighter, quicker scattering of small particles.