Another poster already answered this question well, but I wanted to add that some parishes have Adoration chapels with 24-hr Eucharistic Adoration, where a consecrated host is displayed in a monstrance, a beautiful golden frame that is in the shape of a Sun.
Other parishes are not able to have a dedicated chapel, and do not have enough available adorers (people who volunteer for time slots), so they might have a regularly occurring time for Eucharistic Adoration for the whole parish. Some parishes cannot manage this either, due to their circumstances, but they still might have open hours for the Church where the faithful may come and go for prayers and for adoring Jesus in the Eucharist in the consecrated hosts securely locked inside the Tabernacle, the small golden house, usually at the front of the Church in the sanctuary.
Adoration is open to all Christians, not just Catholics. So if you ever want to go, just find out when it is offered at your parish or any local parish, and go. It is really wonderful and quiet and a special time set aside to pray and adore Jesus.