Adaptive behavior is behavior that enables a person to cope in their environment with greatest success and least conflict with others. This is a term used in the areas of psychology and special education. Adaptive behavior relates to everyday skills or tasks that the "average" person is able to complete, similar to the term life skills.

Nonconstructive or disruptive social or personal behaviors can sometimes be used to achieve a constructive outcome. For example, a constant repetitive action could be re-focused on something that creates or builds something. In other words, the behavior can be adapted to something else.

In contrast, maladaptive behavior is a type of behavior that is often used to reduce one's anxiety, but the result is dysfunctional and non-productive coping. For example, avoiding situations because you have unrealistic fears may initially reduce your anxiety, but it is non-productive in alleviating the actual problem in the long term. Maladaptive behavior is frequently used as an indicator of abnormality or mental dysfunction, since its assessment is relatively free from subjectivity. However, many behaviors considered moral can be maladaptive, such as dissent or abstinence.

Adaptive behavior reflects an individual's social and practical competence to meet the demands of everyday living.

Behavioral patterns change throughout a person's development, life settings and social constructs, evolution of personal values, and the expectations of others. It is important to assess adaptive behavior in order to determine how well an individual functions in daily life: vocationally, socially and educationally.

Limitations in self-care skills and social relationships, as well as behavioral excesses, are common characteristics of individuals with mental disabilities. Individuals with mental disabilities—who require extensive supports—are often taught basic self-care skills such as dressing, eating, and hygiene. Direct instruction and environmental supports, such as added prompts and simplified routines, are necessary to ensure that deficits in these adaptive areas do not limit one's quality of life.

Most children with milder forms of mental disabilities learn how to take care of their basic needs, but they often require training in self-management skills to achieve the levels of performance necessary for eventual independent living. Making and sustaining personal relationships present significant challenges for many persons with mental disabilities. Limited cognitive processing skills, poor language development, and unusual or inappropriate behaviors can seriously impede interactions with others. Teaching students with mental disabilities appropriate social and interpersonal skills is an important function of special education. Students with mental disabilities often exhibit more behavioral problems than students who do not have similar disabilities. Some behaviors observed by students with mental disabilities are difficulty accepting criticism, limited self-control, and inappropriate behaviors. The greater the severity of the mental disabilities, generally the higher the incidence of behavioral problems.^{[citation needed]}

One problem with assessments of adaptive behavior is that a behavior that appears adaptive in the short run can be maladaptive in the long run and vice versa. For example, in the case of a group with rules that insist on drinking harmful amounts of alcohol both abstinence and moderate drinking (moderate as defined by actual health effects, not by socially constructed rules) may seem maladaptive if assessments are strictly short term, but an assessment that focuses on long-term survival would instead find that it was adaptive and that it was obedience under the drinking rule that was maladaptive. Such differences between short term effects and long-term effects in the context of harmful consequences of short-term compliance with destructive rules are argued by some researchers to show that assessments of adaptive behavior are not as unproblematic as is often assumed by psychiatry.