A sacramental is "sacred signs which bear a resemblance to the sacraments. They signify effects, particularly of a spiritual nature, which are obtained through the intercession of the Church. By them men are disposed to receive the chief effect of the sacraments, and various occasions in life are rendered holy."  

Catechism of the Catholic Church 1667

Within the church, there are various sacramentals.  The most common type of a sacramental is holy water. Sacramental blessing can be of persons, meals, objects and places   "Every blessing praises God and prays for his gifts. In Christ, Christians are blessed by God the Father "with every spiritual blessing." This is why the Church imparts blessings by invoking the name of Jesus, usually while making the holy sign of the cross of Christ."

Catechism of the Catholic Church 1671 

There are different sacramentals in the Church.  These items and  gestures remind us of God and at the same time connect us with the sacraments.