기억하다(gi-eok-ha-da, gieokhada)
To retain or recall something in one’s mind
When to use
Recalling past experience, Storing information, Remembering appointments
The nuance
Use 기억하다 when recalling or storing something experienced or learned in the past. It has a positive nuance implying the information is kept well and not lost.
잊다(ij-da, ijda)
To no longer recall or fail to remember something previously known
When to use
Forgetting information, Missing appointments, Admitting mistakes
The nuance
Use 잊다 when you fail to recall information you previously knew or when it unintentionally disappears from memory. Often associated with negative situations or mistakes.