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Caminar vs. pasear vs. andar

While the Spanish verbs andar, caminar, and pasear can all be translated as to walk, they carry distinct nuances. Caminar refers to the physical act of walking, pasear implies walking for pleasure or leisure, and andar is a more general and versatile term for movement or even functioning.

Caminar

A1
This is the most direct and neutral term for to walk. It describes the physical action of moving forward on foot, step by step. It often implies a purpose, a destination, or a focus on the physical exercise itself.
El médico me dijo que debo caminar todos los días.
(The doctor told me that I should walk every day.)
Caminamos hasta la cima de la montaña en tres horas.
(We walked to the top of the mountain in three hours.)
El niño ya está aprendiendo a caminar.
(The child is already learning to walk.)
Prefiero caminar al trabajo para evitar el tráfico.
(I prefer to walk to work to avoid traffic.)

Pasear

A2
This verb means to stroll or to take a walk. It specifically refers to walking for pleasure, recreation, or relaxation. The focus is on the enjoyment of the activity, not on reaching a destination. It is also used for to walk a dog.
Los domingos nos gusta pasear por el parque.
(On Sundays we like to take a walk in the park.)
Saco a pasear a mi perro dos veces al día.
(I take my dog for a walk twice a day.)
Los enamorados paseaban por la orilla del río.
(The lovers were strolling along the riverbank.)
Después de cenar, salimos a pasear para bajar la comida.
(After dinner, we went out for a walk to digest the food.)

Andar

A2
This is a very versatile and common verb. While it can mean to walk (often in a more informal way than caminar), its meaning is much broader. It can mean to go, to move about, or refer to the state or functioning of a person or object.
Anda con cuidado, que el suelo está mojado.
(Walk carefully, the floor is wet.)
Mi reloj viejo ya no anda bien.
(My old watch doesn't work well anymore.)
Mi hermano anda buscando un nuevo trabajo.
(My brother is going around looking for a new job.)
¿Cómo andas? Hace mucho que no te veo.
(How are you doing? I haven't seen you in a long time.)
Siempre anda en bicicleta a todas partes.
(He always goes everywhere by bicycle.)

Summary

In essence, choose caminar for the specific, physical act of walking. Use pasear when the walk is a leisurely or recreational activity. Opt for andar as a general, often informal, term for walking, moving, or describing how someone or something is functioning. While andar and caminar can sometimes be interchanged when referring to walking, pasear always implies leisure.