Kuya whats with the Palm?

I went to church today only to realize that it's Palm Sunday. Vendors were all over the place selling palms. For the sake of tradition, I bought two pieces and let the priest bless it with Holy Water, at least, that would the average christian do. When I arrived home, I placed the palms on the altar. As I was about to do that, my cousin saw me and asked me with a question I couldn't answer: "Kuya what is that for?". Sarcastically, he could have said "Whats with the Palm?". I delightfully answered "I don't know". I was so embarrassed that I couldn't answer him. It was like a whirlwind of a question. My brain was devastated.

So what is the deal with the palm? And why did they call it Palm Sunday? 

I made a rescue operation to save my brain from total devastation and found this.

Go to Church everyone. Have a blessed Palm Sunday.