Injection systems are mechanisms used to introduce fuel or other substances into an engine or system. In automotive applications, they ensure precise delivery of fuel into the combustion chamber, optimizing performance and efficiency. Common types include gasoline direct injection and diesel fuel injection, each designed for specific engine types. In addition to automotive uses, injection systems are also found in medical applications, such as syringes and auto-injectors, which deliver medications directly into the body. These systems are crucial for ensuring accurate dosages and effective treatment, highlighting their importance across various fields.