yes. in about five billion years the sun will become a red giant.
No. The sun is a Class G star, otherwise known as Class II or yellow dwarf. It is a medium-sized star.
No, the T Tauri star is not a giant star, in fact it is a medium-sized star. It is also a very cold star.
Protostar, Main Sequence, Red Giant, Super Nova, and the Neutron Star.
Color is related to surface temperature, and a "red giant" is cooler than a main sequence, medium-sized star like the Sun.
A medium sized star becomes a red giant or a white dwarf - depending on the circumstances. If the star collapses further than the white dwarf it can supernova or become a blackhole. Supernova'd stars rarely become blackholes - the density of what is left is nowhere near the density a blackhole needs to be born.
A star that is in it's teenage years(medium star) isn't a red giant until it's last years.
There are many "Medium" sized stars. For "What is a medium sized star" see related question.
The Sun is a medium sized star.
A medium-sized star, like our Sun.
Perhaps it is called the Betelgeuse * * * * * But only if you consider a red supergiant to be a medium-sized star!
The sun is a yellow dwarf star and as such is considered a medium-sized star. The term is something of a misnomer as the majority of stars are red dwarfs smaller than the sun. The term dwarf is used to distinguish how much smaller event the sun is than giant stars.
our sun in a medium sized star.