Seasoning timber is essentially just to drain it of water which is called its moisture content. This can cause it to shrink but it helps to prevent warping, splitting, it will become lighter and stronger and it becomes easier to machine.
There are three main ways to reduce moisture in timber which includes kiln, air or chemicals. Using a kiln to reduce water involves a large kiln to reduce a stack of timbers moisture content and it is commonly used because it is non toxic, fairly quick and also easy.
Using air to reduce water is when the timbers moisture content is reduced naturally with air although this method takes a long time.
Using chemicals to reduce water involves the use of chemicals to reduce the timbers moisture content but sometimes it is toxic and can change the timbers colour.
This type of timber is a good woodwork product for things such as outdoor furniture and carpentry because reducing the moisture content helps prevent weathering and swelling. it is not as good for interior furniture and isn't really used in cabinet making.
If you are interested in making your own outdoor furniture a wood such as seasoned pine is a good product to start with because it is fairly affordable plus because it has been dried almost all of its strengths will be increased.
For example the timbers ability to absorb a finish or adhesive will be even better than untreated pine because of its reduced moisture content. This is why the dried timber is a great option for outdoor products.