def data_concat(pd,data_scnt,data_anlst,data_eng,mach_learn):
    """
    Find all data science domain jobs and concatenate the dataframe
    created for each job category
    returns concatenated dataframe
    """
    data_scnt['data']='Data Scientists'
    data_anlst['data']='Data Analysts'
    data_eng['data']='Data Engineer'
    mach_learn['data']='Machine Learning'
    jobs = [data_scnt,data_anlst,data_eng,mach_learn]
    datajobs = pd.concat(jobs)
    return datajobs