"Por lo tanto" and "por consiguiente" are two phrases that help us understand cause and effect. But they are used in different situations.

1. Formality:

   • Por lo tanto: This phrase is good for everyday talk or writing. You can use it in casual conversations.
   • Por consiguiente: This one sounds more serious. It's usually used in school settings or at work.

2. Usage:

   • Por lo tanto:
     • For example: "Estudió mucho, por lo tanto aprobó el examen." This means, "He studied a lot, so he passed the exam."
   • Por consiguiente:
     • For example: "La evidencia presentada es contundente; por consiguiente, debemos reconsiderar nuestra posición." This means, "The evidence presented is strong; therefore, we need to rethink our stance."

Understanding the difference between these phrases can help make your conversations and writing clearer. Whether you are talking casually or formally, using the right phrase matters!