Training and development means teaching people new skills and helping them grow and improve in their jobs. Just like how you learn new things in school, adults need to learn new things too so they can do their jobs better.
Companies want their employees to be the best they can be, so they spend time and money to teach them new skills or improve the skills they already have. This can make the company more successful and help the employees get better jobs in the future.
Training might happen in a classroom or online, where someone will explain or show how to do something new. Development might happen when a company gives an employee a mentor or coach to help them learn and grow in their job.
Overall, training and development is a way to help people do their jobs better, become more valuable to the company, and have more opportunities for their own careers.