I am a Taoist and a member of the Reform Taoist Congregation. The concept of Tao is the Reform Taoists most deeply held belief, and the foundation of our religion. The definition of Tao listed on the Reform Taoism website say that the Chinese word "Tao" roughly translates as "Way" and for Reform Taoists it refers to, amongst other things, a non-sentient, impersonal power that surrounds and flows through all things, living and non-living.
The Tao regulates Natural processes and nourishes balance in the Universe. Lao-tse, the ancient Chinese philosopher widely regarded as the founder of Taoism, taught that the Tao simply defies description and that the only true way to seek it is through personal spiritual exploration and dedication.
Reform Taoists believe that Death is not a loss, but a transformation, and that what we knew as a living person moves on in Death to participate in the endless dance of manifestation and change that is the Tao.