Languages vary, however, these variations meet only the surface of the language levels, such as the level of lexicon.

Language change is a progressive, complex, long and regular process that may happen at all language levels.

Language change is a conscious process, so it can be prevented by its speakers through the exclusive use of standards.

Languages not only change but evolve, for their linguistic community also evolve alongside the historical and cultural events.

Language change and language evolution are synonyms and are used interchangeably to describe the same phenomenon since languages change because they evolve and vice-versa.