VY Canis Majoris
Trifid is a nebula, not a star. For a the largest star, see related question.
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VY Canis Majoris [See Link] has the largest diameter of any known star, 1800 to 2100 times that of the Sun. This gives it a similar diameter to the orbit of Saturn. It is classed as a red super-giant , high luminosity M star as per the stellar classification [See Link] putting it at the upper right hand corner of the Hertzsprung--Russell diagram [See Link]
Yes, it's one of the largest stars we can see, and is classified as a red supergiant.
Yes, It is is the largest star discovered to date, the fact that we can see it is why we know about it.
The largest type of star is a hypergiant.VY Canis Majoris is the largest known star. It is 2,100 times larger than our own Sun.
No, the sun is a star but it is not the largest star in the solar system. It is actually an average-sized star compared to others in the universe. The largest star known is UY Scuti.
sunflower star
The second largest star is UY Scuti, a red supergiant star located in the constellation Scutum. It is one of the largest known stars in the universe in terms of volume.
We can only see stars that are relatively near-by. It would be more appropriate to ask about the largest known star. Stars are known that have about 2000 times the Sun's diameter, but it isn't known for sure which of them is the largest, since there is some uncertainty in the diameters of some far-away stars.
OOoh - toooo many to mention. The largest is VY Canis Majoris. See related question.