Can someone tell me what is employee training and employee development?

In some ways, they may be similar.

Employee training can occur before a person starts a new job with a company or agency; it can also take place after a person has been hired, especially if he/she is moving into a new job within the company or agency. (Promotion maybe?)

Employee development is that training and inservicing that occurs once someone is hired and in a particular position. It's intended to keep him/her "up to speed" for the job currently held.

Those are my interpretations, based on working in a school district in many different jobs over 30 years.