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"Aquí" and "acá" both mean "here," and they can be used interchangeably in most situations. However, "acá" is more commonly used in Latin America, while "aquí" is more commonly used in Spain.

"Allí" and "allá" both mean "there," but there is a slight difference in their usage. "Allí" is used to refer to a place that is relatively close to the speaker, while "allá" is used to refer to a place that is further away.

For example, if you are pointing to a building across the street, you would say "allí está el edificio" (the building is there), but if you are pointing to a mountain in the distance, you would say "allá está la montaña" (the mountain is over there).

Overall, aquí/acá and allí/allá are both commonly used to indicate location, but the choice between them depends on the distance from the speaker and the dialect of Spanish being spoken.