IBPS PO is for Probationary Officer posts; IBPS Clerk is for clerical or customer service associate posts.
PO has prelims, mains and an interview; Clerk has prelims and mains with no interview.
The PO mains is tougher and includes descriptive and higher-difficulty sections.
PO is an officer-grade job with a faster promotion path; Clerk is an entry-level clerical role.
Eligibility for both is a bachelor’s degree in any discipline.