A more thorough explanation:

Definition: To adopt means to take on or accept something, such as a plan, technique, or attitude. It can also mean to legally become the parent of a child who is not biologically yours and take care of them as your own.

• After researching different diets, I decided to adopt a plant-based lifestyle.
• The company decided to adopt a new marketing strategy to reach a wider audience.
• My sister and her husband decided to adopt a child from a local adoption agency.

The first two examples illustrate adopting a plan or technique, while the third example illustrates adopting a child. In both cases, the person or people involved are choosing to take on something new and make it a part of their lives.