Override Standard Buttons in Salesforce Lightning Experience

Using lightning:actionOverride in lightning component you can override standard buttons in Salesforce Lightning Experience.

Sample Code:

<aura:component implements="lightning:actionOverride" access="global">
    
    <!--Component Start-->
    <div class="slds-m-around--xx-large">
        Standard button override demo
    </div>
    <!--Component End-->
</aura:component>