What is faith?

You know, I feel like we Catholics don't talk enough about faith. Of course, we Catholics deny the Protestant belief in "faith alone" (and, indeed, it seems to me Protestants can't even agree with each other on that even means, not to mention, not all Protestants hold to faith alone). I do, however, think we have a poor idea of explaining our faith.
"What is your religion"? We might have some smug person telling us that "I don't have a religion, I have a relationship". (Not sure how that person explains James 1:26-27), I would usually say that I am a Catholic Christian, but, others, may say that they belong to the Catholic Church or the Catholic faith. But, for right now, it's that word "faith", I want to focus on. So, what is faith? Is it blind obedience?   I would argue that it is obedience but not blind obedience. And, luckily for us, the Bible tells us what faith is. It may be easier for some people to write what it isn't, but, my area of expertise is the Bible, so, this is why it's easier for me to explain.
"Now faith is the assurance of things hoped for, the conviction of things not seen, for by it the people of old received their commendation. By faith we understand that the universe was created by the word of God, so that what is seens was not made out of things that are visible". (Hebrews 11:1-3).
There's more, but, as I like to say, go read the rest yourself. Hebrews is one of the most beautiful books of The Holy Bible, and I encourage you to read it. Especially when you're feeling weak in your faith.

*Works used: Bible version used, ESV Catholic Edition with Deuterocanonical Books, Copyright 2017 by Crossway.