Conveys emotional support, often during difficult times or emotional distress. When her mother was ill, Emily was there for her every day.
Pro Tip 2/3
Not Physical Only
Doesn't necessarily mean physically present; can also mean being available to talk or listen. Even though he's abroad, he's always there for me on the phone.
Pro Tip 3/3
Long-term Commitment
Implies a promise of ongoing support, not just a one-time help. No matter what happens, I'll be there for you in the long run.