Difference between AddMvc() and AddMvcCore()

ConfigureServices.cs

  public void ConfigureServices(IServiceCollection services)
        {
            var builder = services.AddMvcCore();
            builder.AddJsonFormatters();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.UseStaticFiles();

            app.UseMvcWithDefaultRoute();

            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }