Colonization is a physical act of people from one region invading and settling another region. The original inhabitants of the newly colonized land are the victims of colonization. This can take the form of oppressive laws and social structures in which the colonizing culture is privileged.
In addition, colonizers also seek to influence and control the indigenous people of a land through ideas, beliefs, values, and customs. In other words, they seek to replace the original culture with the culture of the invaders. When the indigenous people absorb the colonial culture and internalize its beliefs and values, this can be called mental colonization or "colonization of mind."
Therefore, "decolonization of mind" is a process by which an indigenous resident of a place resists the culture of the oppressive colonizers. This is a mental process in which one's identity, beliefs, and values are questioned. An example of this might look like an indigenous person engaging in this kind of self-reflection: "Money is so important to me. I work more than I see my family. Where does this value come from? Did my ancestors value money this much, or did I get this priority from the colonizing culture in my country?"
Reclaiming one's traditional culture and refusing to allow the colonizer to define one's identity can be a major part of decolonizing the mind. Embracing the beauty of one's ethnic features rather than following the European standard of beauty is one way to do this. However, the process of decolonizing the mind will likely look different for each person.