ASP.net Razor page Scripts part - is this only Javascript

Hi

In ASP.net razor pages is the bottom part of the page (@section Scripts) shown below used for Javascript? Or can you also put C# code here. I am new to C# and Javascript so am not sure which one this is

@section Scripts {

function filter() {

    var from = $("#from").val(), to = $("#to").val();
    if (from) from = new Date(from);
    if (to) to = new Date(to);
    if (from) {
        if (to)
            f = d => d >= from && d <= to;
        else
            f = d => d >= from;
    }
    else {
        if (to)
            f = d => d <= to;
        else
            f = _ => true;
    }
    $("#scroll-horizontal-datatable tbody tr").each(function (_, r) {
        if (f(new Date($("[data-date]", r).data("date"))))
            $(r).show();
        else
            $(r).hide();
    })
}
    
}

Select allOpen in new window