A remaster is a re-release of an existing game with improved presentation, such as higher resolution, better textures, improved audio, and modern display support, while keeping the underlying game, design, and content substantially the same.
The work in a remaster is technical translation, not redesign. Developers take the original code and assets, raise the resolution and frame rate targets for current hardware, clean up textures and sound where the source material allows, and add quality of life touches such as modern controls, widescreen support, and faster loading. The levels, mechanics, story, and balance stay as they were, including, often, their dated parts.
That restraint is the value for many buyers. A good remaster preserves a game that was trapped on discontinued hardware and presents it fairly on a current screen, rather than replacing it with a modern interpretation. Collections of remasters also serve as preservation, keeping series history playable without original consoles.
The label is abused when the changes are minimal. Players distinguish a careful remaster from a bare port with a new price by looking for real asset work, performance gains, and fixes. When the only improvement is that an old game now runs at a standard resolution, calling it a remaster invites the comparison it fails.
In play"The remaster keeps the original levels exactly as they were, just sharper and at a higher frame rate."