To have made something better or enhanced it.

सुधार किया

English Usage: The technology has improved significantly over the last decade.

Hindi Usage: इस तकनीक में पिछले दशक में काफी सुधार किया गया है।

Made better; enhanced in quality or condition.

बेहतर

English Usage: She feels more confident in her improved skills.

Hindi Usage: उसे अपनी बेहतर क्षमताओं में अधिक आत्मविश्वास महसूस होता है।