* Marcher is the most common and general term for walking.
* Se promener implies a more leisurely walk, often for pleasure or relaxation.
Here are some examples:
* Je marche - I walk
* J'aime me promener dans le parc - I like to walk in the park.
It's important to note that there are other verbs that can be used depending on the context. For example, "se balader" is also used for walking, especially in a more informal setting.