Adding Bias definition

content/modules/ROOT/pages/concepts.adoc

@@ -3,10 +3,9 @@
 == Bias
 
 Definition::
-[quote, Bias]
-____
-...
+[quote, Bias, https://www.ibm.com/think/topics/ai-bias]
 ____
+AI bias, also called machine learning bias or algorithm bias, refers to the occurrence of biased results due to human biases that skew the original training data or AI algorithm—leading to distorted outputs and potentially harmful outcomes.____
 
 Associated properties::
 * xref:properties.adoc#fairness[Fairness]