To merge means to combine two or more things into one. When two lanes of traffic merge on the highway, cars from both lanes blend together into a single lane. When two companies merge, they join together to form one larger company. When you merge your ideas with your friend's ideas for a school project, you're combining them to create something better than either of you had alone.

Think of how two streams merge when they flow together and become one river, or how colors merge on a painter's palette when mixed.

In technology, merging is common too. When you merge documents, you're combining information from different files into one. Video game characters might merge their powers to defeat a boss. In some stories, parallel universes merge, creating wild plot twists.

Merging usually suggests that the separate things lose some of their individual identity to become part of something new. The merged highway lanes aren't “Lane A” and “Lane B” anymore, they're just one lane. When things merge successfully, the result can work better than the separate parts did on their own.