Oracle Database Discussions

Hi DBAs,
I have graduated and interested in heading into dba path.
I heard there's 2 kind of dba, infrastrucrue dba and production dba. can anyone advise what's the differences as i'm new to working society?

heard that the infrastructure dbas are actually task to setup the database infrastructure in r&d environment and tested it before deploying it to production site through raising instructions for production dba to do it. Most of the their time is commited to co-ordinate project between the application team and production team.

please advise.

thanks