马克笔 (mǎ kè bǐ) means “marker” | MotiTan Chinese Dictionary

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她用马克笔给海报涂色。tā yòng mǎ kè bǐ gěi hǎi bào tú sè

She uses a marker to color the poster.

A colored-ink pen that puts clear, visible marks on paper for drawing, filling areas, or highlighting.

记号笔jì hào bǐ: A pen for writing clear labels, letters, or signs.
水彩笔shuí cái bǐ: A pen with water-based colored ink for drawing and coloring.

一种装有彩色墨水、能在纸上清楚地画线、涂色和做记号的笔。yì zhǒng zhuāng yǒu cǎi sè mò shuǐ néng zài zhǐ shàng qīng chǔ dì huà xiàn tú sè hé zuò jì hào de bǐ

马克笔 (mǎkèbǐ, "marker") adapts the sound of English marker and adds 笔 (bǐ, "pen") to show that the borrowed word names a pen.

Labels may add 油性 (yóuxìng, "oil-based") or 水性 (shuǐxìng, "water-based"); oil-based ink usually resists water more, while water-based ink is often easier to wash away.