Generally, travel is related to an individual's movement from one place to another due to work, to meet family/friends for a short while or healthcare. Tourism, on the other hand, refers to the movement of an individual for recreational purposes. People travel to all sorts of locations and places, however, tourism is mainly limited to locations with tourism potential, such as national parks, monuments, museums, beach, big cities, etc.
The two activities are related. Tourism is the business of providing the infrastructure (such as hotels, restaurants, convenience stores, museums, etc.) and services (security, transport, etc.) to facilitate the visit of travelers and tourists. People spend capital during their travel and the tourism industry makes sure that the traveler's stay is comfortable. In this way, people achieve their purpose and the tourism industry gets the capital and stays in business.
Many a times, travel and tourism are used interchangeably, however there are some differences between the two. Tourism is also defined as travel for a relatively longer duration.