Okay kiddo, so the Baltimore Catechism is basically a book that explains the teachings of the Catholic Church in a way that is easy for people, especially children, to understand.
It was created in Baltimore, Maryland in the late 1800s and was used in Catholic schools as a way to teach students about the Catholic faith.
The book is broken down into different sections or chapters, and each chapter talks about different aspects of the Catholic faith, like the Ten Commandments, the sacraments, and prayer.
The Baltimore Catechism uses a question and answer format, which means that it asks a question and then gives an answer that helps explain the question.
For example, a question might be "What is the Holy Eucharist?" and the answer would be "The Holy Eucharist is the sacrament which contains the body and blood, soul and divinity, of our Lord Jesus Christ under the appearances of bread and wine."
The book also includes things like prayers and important Catholic teachings, so that readers can learn everything they need to know about the Catholic faith.
Overall, the Baltimore Catechism is a really helpful tool for people who want to learn more about the Catholic faith and understand its teachings in a simple and easy-to-understand way.