A common type of wood siding is solid wood or lumber. Provided it is well maintained, it can be very durable and has a very nice appearance. You can also use it horizontally, diagonally or vertically.
If you are looking for a less expensive option then hardboard is a good choice. Hardboard siding is usually made up of wooden fiberboard which is compressed and made using a synthetic adhesive. It is then treated with a preservative (EPA approved) to help protect it from decay and insect damage.
Another attractive option is weatherboard or clapboard which is generally installed horizontally using overlapping boards. Woods often used for this are cedar and redwood as they are strong and less prone to decay.
Plywood is another wooden siding option. It can be installed either horizontally or vertically and may even add extra support to the homes structure. Douglas fir, yellow pine and red cedar are among the woods typically used for this.
From this short list its clear to see that if you are thinking about wooden siding for your home, you have many choices.