The Duke and Duchess of Sussex have set out their goal to "build a better world" in an open letter on the website of their non- profit organisation Archewell.
Harry and Meghan also announced partnerships between their foundation and several tech and research-focused groups to pursue their aims.
On the homepage of the Archewell website is a picture of Diana, Princess of Wales with son Harry on her shoulders, while in another black and white image a young Meghan stands as her mother Doria Ragland crouches down to hug her.
In a joint statement, called a "Letter for 2021" that overlays the pictures, the couple say: "I am my mother's son. And I am our son's mother. Together we bring you Archewell.
"We believe in the best of humanity. Because we have seen the best of humanity.
"We have experienced compassion and kindness, from our mothers and strangers alike.
"In the face of fear, struggle and pain, it can be easy to lose sight of this.
"Together, we can choose courage, healing and connection. Together, we can choose to put compassion in action.
"We invite you to join us as we work to build a better world. One act of com- passion at a time."