Motivated Forgetting
Motivated forgetting refers to the idea that we forget some memories because they are unpleasant or threatening. It can be conscious (suppression) or unconscious (repression).
Example: Forgetting an Embarrassing Moment
You might 'forget' an embarrassing event from a party. This could be suppression if you deliberately push it away, or repression if it happens automatically to protect your self-esteem.
Controversy
Repression is a controversial concept; some researchers question whether memories can be truly repressed and later recovered.