Los estudiantes que estudian mucho aprobarán el examen.
English: The students who study a lot will pass the exam.
In Spanish, 'oraciones relativas especificativas y explicativas' are two types of relative clauses. They add information about a noun. 'Especificativas' specify which person or thing we are talking about, while 'explicativas' add extra, non-essential information.
Use 'oraciones relativas especificativas' when you need to identify or specify which thing or person you mean. Use 'oraciones relativas explicativas' to add extra information about a noun that is already clear.
Los estudiantes que estudian mucho aprobarán el examen.
English: The students who study a lot will pass the exam.
Mi hermano, que vive en Madrid, viene de visita.
English: My brother, who lives in Madrid, is coming to visit.
Las casas que tienen jardín son más caras.
English: The houses that have a garden are more expensive.
El coche, que es rojo, es muy rápido.
English: The car, which is red, is very fast.