Working with CSS Grid - How Can You Create Flexible Grids with the fr Unit?

Tell us what’s happening:

Can someone explain why the answer to the question “What is the purpose of the grid-template-columns property in a CSS grid container?” is “It sets the names and track sizing for columns.”. From my understanding of the lecture it sets the number of columns, which isn’t a response. I don’t see anything about naming and I don’t see any definition for “track sizing”.

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Challenge Information:

Working with CSS Grid - How Can You Create Flexible Grids with the fr Unit?
https://www.freecodecamp.org/learn/full-stack-developer/lecture-working-with-css-grid/how-can-you-create-flexible-grids-with-the-fr-unit

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