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React Native is a Javascript framework designed for building native mobile applications because of its code sharing advantage on both Android and iOS devices while React.js is a Javacript UI library framework which gives the developer advantage of JSX (Javascript Syntax Extension) and Virtual DOM creation. React Native uses React UI components to build interactive and smooth running UIs.

Here are some of the core differences - 

• ReactJS and React Native both uses JSX but React Native doesn't use HTML tags while ReactJS uses.
• For Navigation, ReactJS uses React Router while React Native uses its own navigation library.
• For animations, React Native uses animated APIs while ReactJS uses CSS animations.
• For DOM, React Native uses its built-in native APIs while rendering the components, while React.js uses virtual DOM.
• React Native is designed for developing mobile applications while React.js is used for web application development.

JSX stands for JSX stands for Javascript XML. This is a type of syntax extension which allows us to directly write HTML in React by converting HTML into React components, which helps you to easily create user interfaces for your web applications.

The virtual DOM is a programming concept where a virtual representation of UI is kept in memory and synced with the real DOM with the help of a library like ReactDOM. This process is called "Reconciliation".

Whenever any data is changed in UI, the changes are rendered in Virtual DOM first, then Virtual DOM is compared with Real DOM, the Real DOM will be updated only with the things that have been changed.

State is a type of data used by the mutable components and can change their value at any time. The developer initialize the state in the constructor and then invoke the setState function to change its value.

The lifecycle of the component consists of four phases -

• Initialization - The constructor() method is called before anything else when the component is initiated and sets up the initial state and other initial values. This method is called when your component is created but is not added to the DOM. Its main use is to initialize the state and bind this for component methods.
• Mounting - The component is added to the React DOM. Mounting includes the following methods like constructor(), getDerivedStateFromProps(), render(), and componentDidMount().
• Updating - The component receives changed props or states and is called when the components is re-rendered. Updating the component includes shouldComponentUpdate (), componentWillUpdate (), componentDidUpdate () methods.
• Unmounting - The component is removed from the React DOM. It includes the method componentWillUnmount().

After invoking the setState() function, the passed object is merged into the current state of the React component. This process triggers Reconciliation. Reconciliation updates the UI in a most efficient manner. React Native constructs a tree of React elements and compares it with the previously designed element tree. This enables React Native to make updates in the necessary places.

Props stand for Properties in React. Props are the read-only components generally used to render dynamically generated data. Props are passed in the functions as similar as the arguments are passed. Props are always sent from parent to child component and never vice-versa.

• Props are immutable while the States are mutable.
• Props allow you to pass information from one component to another in the argument form, while a State doesn't pass but holds the information about the components.
• Props make a component reusable by passing it to the child component while States do not have any functionality like this.
• Props are external and are controlled by whatever renders the component while the State is internal and is controlled by the React Component itself.
• Props are used to communicate between the components, States can be used for rendering dynamic changes with the component.

Following are the core components of React Native - 

• View - A view is a container that provides layout with flexbox like accessibility controls and touch handling.
• Text - A text nests text strings, displays styles, and manages touch events.
• Image - Image component is responsible for showing different kinds of images to the user.
• ScrollView - ScrollView is a  scrolling container responsible for containing multiple rows and columns.
• TextInput - Users enter the text with TextInput.

If you are trying to hire a React Native Developer. Here is the React Native Developer Job Description that you can use in your hiring.