What will be the end stage in the life cycle of our sun?

The end stage of our Sun's life cycle will be as a red giant, during which it will expand significantly, eventually shedding its outer layers. This process will leave behind a hot core, which will become a white dwarf. Over billions of years, this white dwarf will cool and fade, ultimately becoming a cold, dark remnant known as a black dwarf, although this stage will take longer than the current age of the universe to occur.