Question again

It seems as if the only time I write these things is when I have a question...man technology! Anyway, in a story, whenever a section of a font is a different color because it's a link, and it's in words instead of gibberish...how do you do that?

E.x. Sara Magic sat down quietly at the table, next to her best friend Eliza.

Say that everything but table is purple but table is blue because it's a link to what the table looks like. How do you do that?

I would really appreciate the help! Thank you so much!
~Sweetiepot