organum, i'm almost 100% sure
(lemme know if it's right, i have the same question)
Answer:
Mosaic
Explanation: The use of tiles as a medium would point to the artwork being called a mosaic. Tessera is another name for the tiles used in a mosaic.
Answer: Higher resolutions mean that there are more pixels per inch (PPI), resulting in more pixel information and creating a high-quality, crisp image.
Explanation: