Most people want the best for their families when they pass. They want to ensure that their families have the financial security and support they need. Other times, people have valuable property that needs to be maintained for years after a person's death.
People work their entire lives in order to be able to live comfortably. Over time people acquire personal property that help people enjoy life and eventually retire. A lot of the time, people will have money or other assets that they want to be able to pass on to their family when they die. Since people cannot take assets with them, certain legal tools have developed so people can distribute their assets.