In the Spanish language, there are several ways to say 'hello' depending on the time of day and level of formality. One of the most common greetings is 'hola', which translates to 'hello' or 'good morning/afternoon'. Another popular option is 'buenos días' for good morning, 'buenas tardes' for good afternoon, and 'buenas noches' for good evening. For a more formal greeting, you can use 'señorita' or 'señor' followed by the person's last name, which means 'young lady' or 'sir'. In some regions of Spain, especially in Andalusia, people often say 'adiós' (goodbye) instead of 'hasta luego' (see you later). When interacting with children or older individuals, using 'abuelo' or 'abuela' is a polite way to express affection and respect. Remember that greetings can vary across different countries and regions in Spain, so it's always a good idea to learn the local customs when traveling.