Don’t get confused with Intarsia and Jacquard ~ both are special in their own way, but get mixed up by many.
Here is a Bessie May Jacket Design ~ is it worked in Intarsia or Jacquard, and more importantly do you care, apart from the fact that the block pattern creates a defined jacket that has almost animal magnetism, which was the aim.
What is your guess ~ well it is Jacquard. Clues are it has geometric or stylised natural forms, and is double thickness as the yarns are carried from beginning to end, and woven in as appropriate.
How is this different to Intarsia ~ well think of a knitted feature, such as a picture of a flower. Intarsia is used for working large blocks of colour, often on a plain background. Quite often there are several colours in a row, and each colour is a separate length of yarn, just like when doing coloured embroidery. None of the colours are carried across the row, as they are in this geometric Jacquard design.
Both methods are important to master, as they are great for adding colours, blocking, picture features, and you will never struggle again with tension if you can master a Jacquard or Intarsia design without creating a tight fabric, but one that has natural drape, then gold stars all round, and the world of knit is your oyster ~ so to speak.