In: Psychology
Locus of control is a personality characteristics wherein a person has a varying degree of faith and/or belief in either external factors or internal factors for certain outcomes. If a person has an internal locus of control, the person believes that they have control over their life and they can influence changes.
People who have an external locus of control tend to blame factors that are away from them and unto factors that are outside and external, and believe that they cannot change or influence changes.
In an education setting, the classic example would that of a student who after gaining good marks would praise the paper instead of praising his own skill of studying. And, the other student who'd praise himself and think it was his technique of studying that score him good marks as opposed to the question paper.
For instance in Life goals, an individual who believes that he or she has been unemployed for a major chunk of their life due to outside factors (External). And, their would also be a person who would blame himself/herself for not being able to bag a job as of yet (Internal).
In terms of Relationships, an individual who has been rejected by a potential lover would put the blame on other external life conditions such as people, family for the rejection; whereas a person who takes the blame onto himself/herself would probably blame the features, personality characteristics of self etc.