Operation Christmas Child is a function of Samaritan's Purse, the mission organization run by Franklin Graham, Billiy Graham's son. You fill a shoe box with toys, socks, school supplies, etc for either a boy or girl and they ship the decorated boxes to places where kids don't get Christmas. Sometimes it's here in the U.S.;sometimes it's overseas. The organization goes into the community and puts on a big party for the families and distributes the gifts.
We do this every year. Each of my children does a box. This year, we will do two boxes, one for a 12yo girl and one for a 10yo boy. I collect small toys and school items all through the year to put in these boxes. We set aside extra money for charity at Christmas so that we can do this. My DD12 just loves shopping for "her" girl. Just about anything goes(except war toys and chocolate) and she crams it all into her box. We take them to church, where they are sent to the distribution warehouse. The adults in my church also work one weekend at teh warehouse, checking the boxes for "contraband" (drugs, liquids, candy, weapons,etc)