The word "touching" has a number of meanings, depending on its context.
1) Physically touching something or someone with your hand or other body part. For example, "I touched my forehead when I had a headache."
2) Affecting someone emotionally or mentally. For example, "The story was so touching that it brought tears to my eyes."
3) Encouraging or persuading someone to do something. For example, "We need to find a way to touch base with all our customers."
4) Involving or relating to something in some way. For example, "The painting had a touch of sadness in its colors and composition."
5) A gesture of affection or kindness. For example, "He gave her a friendly pat on the back as she left."