Polite and common term for one's own father or someone else's father. Used both referentially and as a form of address.
See also: 父さん
My father is an office worker.
Dad, come here a moment.
Used by a wife to refer to her own husband, especially when speaking to children or others. Carries a warm, familiar tone.
My husband is good at cooking.
Familiar, somewhat old-fashioned way to address or refer to an elderly man older than the speaker. Can sound patronizing if used inappropriately.
How are you, sir? (to an elderly man)
He really takes after his father.
I forgot my homework and got scolded by my dad.
I help my dad every weekend.
お父さん is the standard polite word for father, while パパさん is a more casual, family-register term for the same person.
父ちゃん is the childlike, very casual word for dad, while お父さん is the neutral, more polite term used by children and adults alike.
お父さん is the everyday polite word for father, while お父様 is a more elevated, formal version used in especially polite speech or writing.
お父さん is the standard, polite way to refer to one's father, while パパ is a childish, intimate term used mainly within the family.
お父さん is the warm, everyday term for addressing one's own father or referring respectfully to someone else's father, while 父親 is more formal and detached.
お父さん is the polite, everyday word for father usable by anyone, whereas 親父 is a blunter, more masculine term often carrying a rough or affectionate edge.