Lightning Data Service (LDS) is to serve as the data layer for Lightning. It is similar like Standard Controllers in Visualforce Page.

Advantages of Lightning Data Service:

• Lightning Data Service allows to load, create, edit, or delete a record without requiring Apex code and SOQL query.
• Lightning Data Service handles sharing rules and field-level security.
• Records loaded in Lightning Data Service are cashed and shared across all components.
• When one component updates a record, the other component using it are notified.
• Lightning Data Service supports offline in Salesforce1.

In below example I’m creating Lead object record using Lightning Data Service. By using the new base lightning component lightning:recordEditForm, we can create and edit records, without custom Javascript and Apex code.

Lightning Component:

<!--Sample.cmp--> 
<aura:component implements="flexipage:availableForAllPageTypes,force:appHostable">
    
    <!--Component--> 
    
<div class="slds-m-around--xx-large">
        <lightning:card title="Lead" iconName="standard:lead" class="slds-p-around_medium">
            <lightning:recordEditForm aura:id="leadCreateForm" objectApiName="Lead" onsuccess="{!c.handleOnSuccess}">
                <lightning:messages />
                
                
<div class="slds-grid">
                    
<div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="FirstName"></lightning:inputField>
                    </div>

                    
<div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="LastName"></lightning:inputField>
                    </div>

                </div>

                
                
<div class="slds-grid">
                    
<div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Email"></lightning:inputField>
                    </div>

                    
<div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Phone"></lightning:inputField>
                    </div>

                </div>

                
                
<div class="slds-grid">
                    
<div class="slds-col slds-size_1-of-2 slds-p-around_medium">
                        <lightning:inputField fieldName="Company"></lightning:inputField>
                    </div>

                </div>

                
                <lightning:button type="submit" label="Save" variant="brand"/>
            </lightning:recordEditForm>
        </lightning:card>
    </div>

</aura:component>

Lightning JS Controller:

({
    handleOnSuccess : function(component, event, helper) {
        var toastEvent = $A.get("e.force:showToast");
        toastEvent.setParams({
            "title": "Success!",
            "message": "The record has been created successfully.",
            "type": "success",
            "mode": "pester"
        });
        toastEvent.fire();
        $A.get("e.force:refreshView").fire();
    }
})