Harry Potter Wands
We can describe a wand as a magical instrument through which a witch/wizard channels his/her magic. It is made from wood and with a magical substance in the core.
Most spells are cast with the aid of wands, you can do wandless magic, however, is very difficult and requires much concentration and incredible skill.
"The wand chooses the wizard, Mr. Potter. It's not always clear why."(said by Ollivander, manufacturer and seller’s wands in Harry Potter)
Ollivander describes Harry’s wand as an unusual combination of wand core and wood because it’s made of holly and phoenix feather core.