A patio can be a wonderful place to relax during the warm days of spring, summer, and autumn; or all year if you live in warmer climes.
At times when the lawn may be too wet or even muddy, the solid floor of a patio means you can sit outside even after heavy rain and make the most of the fresh air, and visual pleasure of your garden.
You can even turn your patio into a patio garden to make it more interesting. You can turn the plainest of patios into a patio garden with the good use of containers or outdoor planters. If you are starting from nothing, and designing and building (or having designed and built) a completely new patio, then it is worth giving the garden aspect of the patio some forethought.
The reason for the pre-planning is that you have an opportunity to create something very special with little extra expense beyond the foundation work and the patio floor.