A bond is simply a deed (a deed being a document in writing on paper which is signed, sealed, and delivered ...) whereby one person undertakes to pay a specified sum of money to another, either immediately or at a future date.
Correlation is a statistical measure (expressed as a number) that describes the size and direction of a relationship between two or more variables. A correlation between variables, however, does not automatically mean that the change in one variable is the cause of the change in the values of the other variable. Causation indicates that one event is the result of the occurrence of the other event; i.e. there is a causal relationship between the two events.
When I do (some independent variable), then (some dependent variable) will happen.. An example: If I were to grab Michelle Obama's purse, then she would yell at me.. Of course, there can be more than one dependent variable in an experiment. All of which are dependent variables in this case. For scientific purposes, it's usually best to change only one thing (the independent variable) and look for one resulting change (the dependent variable).